Pacific Premier Bancorp (PPBI) 10-K 1 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2018	Feb. 22, 2019	Jun. 30, 2018
Document and Entity Information
Entity Registrant Name	PACIFIC PREMIER BANCORP INC
Entity Central Index Key	1,028,918
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 1.8
Entity Common Stock, Shares Outstanding		62,496,827
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY

CONSOLIDATED STATEMENTS OF FINA

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 43,641	$ 39,606
Interest-bearing deposits with financial institutions	159,765	157,558
Cash and cash equivalents	203,406	197,164
Interest-bearing time deposits with financial institutions	6,143	6,633
Investments held-to-maturity, at amortized cost (fair value of $44,672 and $18,082 as of December 31, 2018 and December 31, 2017, respectively)	45,210	18,291
Investment securities available-for-sale, at fair value	1,103,222	787,429
FHLB, FRB and other stock, at cost	108,819	65,881
Loans held for sale, at lower of cost or fair value	5,719	23,426
Loans held for investment	8,836,818	6,196,224
Allowance for loan losses	(36,072)	(28,936)
Loans held for investment, net	8,800,746	6,167,288
Accrued interest receivable	37,837	27,060
Other real estate owned	147	326
Premises and equipment	64,691	53,155
Deferred income taxes, net	15,627	13,265
Bank owned life insurance	110,871	75,976
Intangible assets	100,556	43,014
Goodwill	808,726	493,329
Other assets	75,667	52,264
Total assets	11,487,387	8,024,501
Deposit accounts:
Noninterest-bearing checking	3,495,737	2,226,876
Interest-bearing:
Checking	526,088	365,193
Money market/savings	3,225,849	2,409,007
Retail certificates of deposit	1,009,066	714,751
Wholesale/brokered certificates of deposit	401,611	370,059
Total interest-bearing	5,162,614	3,859,010
Total deposits	8,658,351	6,085,886
FHLB advances and other borrowings	667,681	536,287
Subordinated debentures	110,313	105,123
Accrued expenses and other liabilities	81,345	55,209
Total liabilities	9,517,690	6,782,505
STOCKHOLDERS’ EQUITY
Preferred stock, $.01 par value; 1,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $.01 par value; 150,000,000 and 100,000,000 shares authorized at December 31, 2018 and 2017; 62,480,755 shares and 46,245,050 shares issued and outstanding, respectively	617	458
Additional paid-in capital	1,674,274	1,063,974
Retained earnings	300,407	177,149
Accumulated other comprehensive (loss) income	(5,601)	415
Total stockholders’ equity	1,969,697	1,241,996
Total liabilities and stockholders’ equity	$ 11,487,387	$ 8,024,501

CONSOLIDATED STATEMENTS OF FI_2

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Estimated Fair Value	$ 44,672	$ 18,082
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	150,000,000	100,000,000
Common stock, shares issued (in shares)	62,480,755	46,245,050
Common stock, shares outstanding (in shares)	62,480,755	46,245,050

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
INTEREST INCOME
Loans	$ 415,410	$ 251,027	$ 157,935
Investment securities and other interest-earning assets	33,013	18,978	8,670
Total interest income	448,423	270,005	166,605
INTEREST EXPENSE
Deposits	37,653	13,371	8,391
FHLB advances and other borrowings	11,343	4,411	1,295
Subordinated debentures	6,716	4,721	3,844
Total interest expense	55,712	22,503	13,530
Net interest income before provision for credit losses	392,711	247,502	153,075
Provision for credit losses	8,253	8,432	9,296
Net interest income after provision for credit losses	384,458	239,070	143,779
NONINTEREST INCOME
Loan servicing fees	1,445	787	1,032
Earnings on bank-owned life insurance	3,427	2,279	1,353
Net gain from sales of loans	10,759	12,468	9,539
Net gain from sales of investment securities	1,399	2,737	1,797
Other income	3,641	5,680	2,639
Total noninterest income	31,027	31,114	19,602
NONINTEREST EXPENSE
Compensation and benefits	129,886	84,138	52,836
Premises and occupancy	24,544	14,742	9,838
Data processing	13,412	8,206	4,261
Other real estate owned operations, net	4	72	385
FDIC insurance premiums	3,002	2,151	1,545
Legal, audit and professional expense	10,040	6,101	3,041
Marketing expense	6,151	4,436	3,981
Office, telecommunications and postage expense	5,312	3,117	2,107
Loan expense	3,370	3,299	2,191
Deposit expense	9,916	6,240	4,904
Merger-related expense	18,454	21,002	4,388
CDI amortization	13,594	6,144	2,039
Other expense	12,220	8,310	6,547
Total noninterest expense	249,905	167,958	98,063
Net income before income taxes	165,580	102,226	65,318
Income tax	42,240	42,126	25,215
Net income	$ 123,340	$ 60,100	$ 40,103
EARNINGS PER SHARE
Basic (in dollars per share)	$ 2.29	$ 1.59	$ 1.49
Diluted (in dollars per share)	$ 2.26	$ 1.56	$ 1.46
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	53,963,047	37,705,556	26,931,634
Diluted (in shares)	54,613,057	38,511,261	27,439,159
Service charges on deposit accounts
NONINTEREST INCOME
Noninterest income	$ 5,128	$ 3,273	$ 1,459
Other service fee income
NONINTEREST INCOME
Noninterest income	902	1,847	1,516
Debit card interchange fee income
NONINTEREST INCOME
Noninterest income	$ 4,326	$ 2,043	$ 267

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income		$ 123,340	$ 60,100	$ 40,103
Other comprehensive (loss) income, net of tax:
Unrealized holding gains/(losses) on securities arising during the period, net of income tax (benefits)	[1]	(5,019)	4,937	(2,013)
Reclassification adjustment for net gain on sale of securities included in net income, net of income taxes	[2]	(1,079)	(1,801)	(1,040)
Other comprehensive (loss) income, net of tax		(6,098)	3,136	(3,053)
Comprehensive income, net of tax		$ 117,242	$ 63,236	$ 37,050
[1]	(1) Income tax (benefit) on unrealized holding gains (losses) on securities was ($2.2 million) for 2018, $3.1 million for 2017 and $(1.5 million) for 2016.
[2]	(2) Income tax on reclassification adjustment for net gain on sale of securities included in net income was $320,000 for 2018, $936,000 for 2017 and $757,000 for 2016.

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Tax effect on unrealized holding gains (losses) on securities arising during the period	$ (2,200)	$ 3,100	$ (1,500)
Income tax expense on reclassification adjustment for net gain on sale of securities included in net income	$ 320	$ 936	$ 757

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2015	$ 298,980	$ 215	$ 221,487	$ 76,946	$ 332
Balance (in shares) at Dec. 31, 2015		21,570,746
Increase (Decrease) in Stockholders' Equity
Net Income	40,103			40,103
Other comprehensive income (loss)	(3,053)				(3,053)
Share-based compensation expense	2,729		2,729
Issuance of restricted stock, net (in shares)		296,236
Issuance of common stock	119,383	$ 58	119,325
Issuance of common stock (in shares)		5,815,051
Warrants exercised	379	$ 0	379
Warrants exercised (in shares)		0
Restricted stock surrendered and canceled	(126)	$ 0	(126)
Repurchase of common stock (in shares)		0
Exercise of stock options, net	1,345	$ 1	1,344
Exercise of stock options (in shares)		116,250
Balance at Dec. 31, 2016	459,740	$ 274	345,138	117,049	(2,721)
Balance (in shares) at Dec. 31, 2016		27,798,283
Increase (Decrease) in Stockholders' Equity
Net Income	60,100			60,100
Other comprehensive income (loss)	3,136				3,136
Share-based compensation expense	5,809		5,809
Issuance of restricted stock, net	0
Issuance of restricted stock, net (in shares)		166,397
Issuance of common stock	709,377	$ 181	709,196
Issuance of common stock (in shares)		17,954,274
Goodwill adjustment	500		500
Restricted stock surrendered and canceled	(1,258)		(1,258)
Repurchase of common stock (in shares)		(21,537)
Exercise of stock options, net	4,592	$ 3	4,589
Exercise of stock options (in shares)		347,633
Balance at Dec. 31, 2017	$ 1,241,996	$ 458	1,063,974	177,149	415
Balance (in shares) at Dec. 31, 2017	46,245,050	46,245,050
Increase (Decrease) in Stockholders' Equity
Net Income	$ 123,340			123,340
Other comprehensive income (loss)	(6,098)				(6,098)
Share-based compensation expense	9,033		9,033
Issuance of restricted stock, net	0
Issuance of restricted stock, net (in shares)		270,571
Issuance of common stock	601,171	$ 158	601,013
Issuance of common stock (in shares)		15,758,039
Goodwill adjustment	0
Restricted stock surrendered and canceled	(1,669)		(1,669)
Repurchase of common stock (in shares)		(33,148)
Exercise of stock options, net	1,924	$ 1	1,923
Exercise of stock options (in shares)		240,243
Reclassification of certain tax effects of the Tax Cuts and Jobs Act	0			(82)	82
Balance at Dec. 31, 2018	$ 1,969,697	$ 617	$ 1,674,274	$ 300,407	$ (5,601)
Balance (in shares) at Dec. 31, 2018	62,480,755	62,480,755

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 123,340	$ 60,100	$ 40,103
Adjustments to net income:
Depreciation and amortization expense	7,773	4,888	2,854
Provision for credit losses	8,253	8,432	9,296
Share-based compensation expense	9,033	5,809	2,729
Loss on sale and disposal of premises and equipment	108	234	656
(Gain) loss on sale of or write down of other real estate owned	(355)	(46)	321
Net amortization on securities	6,900	7,601	9,157
Net accretion of discounts/premiums for loans acquired and deferred loan fees/costs	4,224	1,627	1,832
Gain on sale of investment securities available-for-sale	(1,399)	(2,737)	(1,797)
Other-than-temporary impairment recovery on investment securities, net	0	0	(205)
Originations of loans held for sale	(174,718)	(142,104)	(103,883)
Proceeds from the sales of and principal payments from loans held for sale	309,706	140,012	115,877
Gain on sale of loans	(10,759)	(12,468)	(9,539)
Deferred income tax expense	9,275	16,866	3,887
Change in accrued expenses and other liabilities, net	1,388	5,193	(4,948)
Income from bank owned life insurance, net	(2,774)	(1,842)	(1,164)
Amortization of core deposit intangible	13,594	6,144	2,039
Change in accrued interest receivable and other assets, net	(4,901)	(13,932)	(3,768)
Net cash (used in) provided by operating activities	298,688	83,777	63,447
Cash flows from investing activities:
Net increase in interest-bearing time deposits with financial institutions	490	(2,689)	0
Increase in loans, net	(338,671)	(519,163)	(263,075)
Purchase of loans held for investment	(61,562)	(13,582)	(271,159)
Proceeds from sale of other real estate owned	1,058	507	380
Purchase of held-to-maturity securities	(29,002)	(10,914)	0
Principal payments on held-to-maturity securities	1,785	1,166	1,060
Purchase of securities available-for-sale	(462,534)	(306,527)	(190,140)
Principal payments on securities available for sale	131,268	74,891	37,875
Proceeds from sale of securities available-for-sale	407,004	268,596	230,945
Proceeds from the sale of premises and equipment	0	0	10,049
Proceeds from bank owned insurance death benefit	1,284	198	0
Purchases of premises and equipment	(10,295)	(4,165)	(11,970)
Change in FHLB, FRB, and other stock, at cost	(27,086)	(12,838)	(15,012)
Cash acquired in acquisitions, net	146,571	225,945	40,132
Net cash used in investing activities	(239,690)	(298,575)	(430,915)
Cash flows from financing activities:
Net increase in deposit accounts	65,553	187,901	313,770
Net change in short-term borrowings	(108,064)	61,120	181,846
Proceeds from long-term borrowings	0	12,012	0
Repayment of long-term borrowings	(10,500)	(9,262)	(50,927)
Proceeds from exercise of stock options and warrants	1,924	4,592	1,345
Restricted stock surrendered and canceled	(1,669)	(1,258)	(126)
Net cash (used in) provided by financing activities	(52,756)	255,105	445,908
Net change in cash and cash equivalents	6,242	40,307	78,440
Cash and cash equivalents, beginning of year	197,164	156,857	78,417
Cash and cash equivalents, end of year	203,406	197,164	156,857
Supplemental cash flow disclosures:
Interest paid	53,960	21,777	13,564
Income taxes paid	32,296	18,846	13,139
NONCASH INVESTING ACTIVITIES DURING THE PERIOD
Transfers from loans to other real estate owned	15	121	197
Loans held for sale transfer to loans held for investment	337	949	1,274
Assets acquired (liabilities assumed) in acquisitions (See Note 26):
Interest-bearing deposits with financial institutions	0	0	1,972
Investment securities	392,858	442,923	190,254
Loans	2,352,717	2,427,589	456,158
Core deposit intangible	71,943	39,703	4,319
Deferred income tax	4,383	14,959	6,748
Goodwill	313,043	391,070	51,658
Fixed assets	9,122	42,097	4,190
Other assets	97,246	74,379	9,362
Deposits	(2,506,929)	(2,752,501)	(636,591)
Other borrowings	(254,923)	(180,186)	0
Other liabilities	(24,859)	(16,395)	(8,843)
Common Stock and additional paid-in capital	$ (601,172)	$ (716,421)	$ (120,174)

Description of Business and Sum

Description of Business and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Description of Business and Summary of Significant Accounting Policies	Description of Business and Summary of Significant Accounting Policies Description of Business —Pacific Premier Bancorp, Inc., a Delaware corporation organized in 1997 (the “Corporation”), is a California-based bank holding company that owns 100% of the capital stock of Pacific Premier Bank, a California-chartered commercial bank (the “Bank,” and together with the Corporation and its consolidated subsidiaries, the “Company”), the Corporation’s principal operating subsidiary. The Bank was incorporated and commenced operations in 1983. The principal business of the Company is attracting deposits from the general public and investing those deposits, together with funds generated from operations and borrowings, primarily in business loans and real estate property loans. At December 31, 2018 , the Company had 44 depository branches located in the counties of Orange, Los Angeles, Riverside, San Bernardino, San Diego, San Luis Obispo and Santa Barbara, California, as well as Pima and Maricopa Counties, Arizona, Clark County, Nevada and Clark County, Washington. The Company is subject to competition from other financial institutions. The Company is subject to the regulations of certain governmental agencies and undergoes periodic examinations by those regulatory authorities. Principles of Consolidation —The consolidated financial statements include the accounts of Corporation and its wholly-owned subsidiary the Bank. The Company accounts for its investments in its wholly-owned special purpose entities, PPBI Statutory Trust I, Heritage Oaks Capital Trust II, Mission Community Capital Trust I Santa Lucia Bancorp (CA) Capital Trust and First Commerce Bancorp Statutory Trust I, under the equity method whereby the subsidiary’s net earnings are recognized in the Company’s Statement of Income and the investment in these entities is included in Other Assets on the Company’s Consolidated Statements of Financial Condition. The Company is organized and operates as a single reporting segment, principally engaged in the commercial banking business. All significant intercompany accounts and transactions have been eliminated in consolidation. Basis of Financial Statement Presentation —The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States (‘‘U.S. GAAP’’). Certain amounts in the financial statements and related footnote disclosures for the prior years have been reclassified to conform to the current presentation with no impact to previously reported net income or stockholders’ equity. Use of Estimates —The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Estimates may change as new information is obtained. The following discussion provides a summary of the Company’s significant accounting policies: Cash and Cash Equivalents —Cash and cash equivalents include cash on hand, cash balances due from banks and federal funds sold. Interest bearing deposits with financial institutions represent primarily cash held at the Federal Reserve Bank of San Francisco. At December 31, 2018 , there were no cash reserves required by the Board of Governors of the Federal Reserve System (“Federal Reserve”) for depository institutions based on the amount of deposits held. The Company maintains amounts due from banks that exceed federally insured limits. The Company has not experienced any losses in such accounts. Securities —The Company has established written guidelines and objectives for its investing activities. At the time of purchase, management designates the security as either held to maturity, available-for-sale or held for trading based on the Company’s investment objectives, operational needs and intent. The investments are monitored to ensure that those activities are consistent with the established guidelines and objectives. Securities Held-to-Maturity —Investments in debt securities that management has the positive intent and ability to hold to maturity are reported at cost and adjusted for periodic principal payments and the amortization of premiums and accretion of discounts, which are recognized in interest income using the interest method over the period of time to investment’s maturity. Securities Available-for-Sale —Investments in debt securities that management has no immediate plan to sell, but which may be sold in the future, are carried at fair value. Premiums and discounts are amortized using the interest method over the remaining period to the call date for premiums or contractual maturity for discounts and, in the case of mortgage-backed securities, the estimated average life, which can fluctuate based on the anticipated prepayments on the underlying collateral of the securities. Unrealized holding gains and losses, net of tax, are recorded in a separate component of stockholders’ equity as accumulated other comprehensive income. Realized gains and losses on the sales of securities are determined on the specific identification method, recorded on a trade date basis based on the amortized cost basis of the specific security and are included in noninterest income as net gain (loss) on investment securities. Impairment of Investments —Quarterly, the Company evaluates investment securities in an unrealized loss position for OTTI. In determining whether a security’s decline in fair value is other-than-temporary, the Company considers a number of factors including: (i) the length of time and the extent to which the fair value of the investment has been less than its amortized cost; (ii) the financial condition and near-term prospects of the issuer; (iii) the intent and ability of the Company to hold the investment for a period of time sufficient to allow for an anticipated recovery in fair value; (iv) downgrades in credit ratings; and (v) general market conditions which reflect prospects for the economy as a whole, including interest rates and sector credit spreads. If it is determined that an OTTI exists, and either the Company intends to sell the investment or it is likely the Company will be required to sell the investment before its anticipated recovery, the total amount of the OTTI, which is measured as the amount by which the investment’s amortized cost exceeds its fair value, is recognized in current period earnings. If the Company has the intent and ability to hold the investment and it is more likely than not it will be required to sell the investment prior to an anticipated recovery of its amortized cost basis, the Company records in current period earnings the portion of OTTI deemed to be credit related, while the remaining portion of OTTI deemed to be non-credit related is recorded in accumulated other comprehensive income. Credit related losses are determined through a discounted cash flow analysis, which incorporates assumptions concerning the estimated timing and amounts of expected cash flows. Non-credit related OTTI losses result from other factors such as change in interest rates and general market conditions. The presentation of OTTI in the consolidated financial statements is on a gross basis with a reduction in the gross amount for the portion of the loss deemed non-credit related and is recorded in accumulated other comprehensive income. Federal Home Loan Bank Stock —The Bank is a member of the Federal Home Loan Bank System. Members are required to own a certain amount of stock based on the level of borrowings and other factors, and may invest in additional amounts. FHLB stock is carried at cost and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are recorded as a component of interest income. Federal Reserve Bank Stock —The Bank is a member of the Federal Reserve Bank of San Francisco (the “FRB”). FRB stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are recorded as a component of interest income. Loans Held for Sale —Loans that the Company has the intent to sell prior to maturity have been designated as held for sale at origination and are recorded at lower of cost or fair value. Gains or losses are recognized upon the sale of the loans on a specific identification basis. Loan Servicing Assets —Servicing assets are related to SBA loans sold and are recognized at the time of sale when servicing is retained with the income statement effect recorded in gains on sales of SBA loans. Servicing assets are initially recorded at fair value based on the present value of the contractually specified servicing fee, net of estimated servicing costs, over the estimated life of the loan, using a discount rate. The Company’s servicing costs approximates the industry average servicing costs of approximately 40 basis points. The servicing assets are subsequently amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans. The Company periodically evaluates servicing assets for impairment based upon the fair value of the assets as compared to their carrying amount. The Company typically sells the guaranteed portion of SBA loans and retains the unguaranteed portion (“retained interest”). A portion of the premium on sale of SBA loans is recognized as gain on sale of loans at the time of the sale by allocating the carrying amount between the asset sold and the retained interest, based on their relative fair values. The remaining portion of the premium is recorded as a discount on the retained interest and is amortized over the remaining life of the loan as an adjustment to yield. The retained interest, net of any discount, are included in loans held for investment—net of allowance for loan losses in the accompanying consolidated statements of financial condition. Loans Held for Investment —Loans held for investment are loans the Company has the ability and intent to hold until their maturity. The loans are carried at amortized cost, net of discounts and premiums on purchased loans, deferred loan origination fees and costs and ALLL. Net deferred loan origination fees and costs on loans are amortized or accreted using the interest method over the expected life of the loans. Amortization of deferred loan fees and costs are discontinued for loans placed on nonaccrual. Any remaining deferred fees or costs and prepayment fees associated with loans that payoff prior to contractual maturity are included in loan interest income in the period of payoff. Loan commitment fees received to originate or purchase a loan are deferred and, if the commitment is exercised, recognized over the life of the loan using the interest method as an adjustment of yield or, if the commitment expires unexercised, recognized as income upon expiration of the commitment. Interest on loans is recognized using the interest method and is only accrued if deemed collectible. Loans for which the accrual of interest has been discontinued are designated as nonaccrual loans. The accrual of interest on loans is discontinued when principal or interest is past due 90 days based on contractual terms of the loan or when, in the opinion of management, there is reasonable doubt as to collection of principal and or interest. When loans are placed on nonaccrual status, all interest previously accrued but not collected is reversed against current period interest income. Interest income generally is not recognized on nonaccrual loans unless the likelihood of further loss is remote. Interest payments received on nonaccrual loans are applied as a reduction to the loan principal balance. Interest accruals are resumed on such loans only when they are brought current with respect to interest and principal and when, in the judgment of management, the loans are estimated to be fully collectible as to all principal and interest. A loan is considered to be impaired when it is probable that the Company will be unable to collect all amounts due (principal and interest) according to the contractual terms of the loan agreement. The Company reviews loans for impairment when the loan is classified as substandard or worse, delinquent 90 days, determined by management to be collateral dependent, or when the borrower files bankruptcy or is granted concession which qualifies as a troubled debt restructuring. Measurement of impairment is based on the loan’s expected future cash flows discounted at the loan’s effective interest rate, measured by reference to an observable market value, if one exists, or the fair value of the collateral if the loan is deemed collateral dependent. The Company selects the measurement method on a loan-by-loan basis except those loans deemed collateral dependent. Loans for which impairment has been determined are generally charged-off at such time the loan is classified as a loss. Allowance for Loan Losses— The Company maintains an ALLL at a level deemed appropriate by management to provide for known or probable incurred losses in the portfolio as of the date of the consolidated statements of financial condition. The Company has an internal loan review system and loss allowance methodology designed to provide for the detection of problem loans and an appropriate level of allowance to cover loan losses. Management’s determination of the adequacy of the ALLL is based on an evaluation of the composition of the portfolio, actual loss experience, industry charge-off experience on income property loans, current economic conditions, and other relevant factors in the area in which the Company’s lending and real estate activities are based. These factors may affect the borrower’s ability to pay as well as the value of the underlying collateral securing loans. The allowance is calculated by applying loss factors to loans held for investment according to loan type and loan credit classification. The loss factors are based primarily upon the Bank’s historical loss experience and industry charge-off experience, and are evaluated on a quarterly basis. At December 31, 2018 , the following portfolio segments have been identified. Segments are groupings of similar loans at a level, for which the Company has adopted systematic methods of documentation for determining its allowance for loan losses: • Commercial and industrial (including Franchise) - Commercial and industrial (“C&I”) loans are secured by business assets including inventory, receivables and machinery and equipment to businesses located generally in our primary market area. Loan types includes revolving lines or credit, term loans, seasonal loans and loans secured by liquid collateral such as cash deposits or marketable securities. Homeowners’ Association (“HOA”) credit facilities are included in C&I loans. We also issue letters of credit on behalf of our customers. Risk arises primarily due to the difference between expected and actual cash flows of the borrowers. In addition, the recoverability of the Company’s investment in these loans is also dependent on other factors primarily dictated by the type of collateral securing these loans. The fair value of the collateral securing these loans may fluctuate as market conditions change. In the case of loans secured by accounts receivable, the recovery of the Company’s investment is dependent upon the borrower’s ability to collect amounts due from its customers. • Commercial real estate (including owner-occupied and nonowner occupied) - Commercial real estate (“CRE”) includes various type of loans which the Company holds real property as collateral. CRE lending activity is typically restricted to owner-occupied or nonowner-occupied. The primary risks of real estate loans include the borrower’s inability to pay, material decreases in the value of the real estate that is being held as collateral and significant increases in interest rates, which may make the real estate loan unprofitable to the borrower. Real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy. • SBA - We are approved to originate loans under the SBA’s Preferred Lenders Program (“PLP”). The PLP lending status affords us a higher level of delegated credit autonomy, translating to a significantly shorter turnaround time from application to funding, which is critical to our marketing efforts. We originate loans nationwide under the SBA’s 7(a), SBA Express, International Trade and 504(a) loan programs, in conformity with SBA underwriting and documentation standards. SBA loans are similar to commercial business loans, but have additional credit enhancement provided by the U.S. Small Business Administration, for up to 85.00% of the loan amount for loans up to $150,000 and 75.00% of the loan amount for loans of more than $150,000. The Company originates SBA loans with the intent to sell the guaranteed portion into the secondary market on a quarterly basis. • Agribusiness and farmland - We originate loans to the agricultural community to fund seasonal production and longer term investments in land, buildings, equipment, crops and livestock. Agribusiness loans are for the purpose of financing agricultural production to finance crops and livestock. Farmland loans include all land known to be used or usable for agricultural purposes, such as crop and livestock production and is secured by the land and improvements thereon. • Multi-family - Loans secured by multi-family and commercial real estate properties generally involve a greater degree of credit risk than one-to-four family loans. Because payments on loans secured by multi-family and commercial real estate properties are often dependent on the successful operation or management of the properties, repayment of these loans may be subject to adverse conditions in the real estate market or the economy. • One-to-four family - Although we do not originate, through our bank acquisitions, we have acquired first lien single family loans, we occasionally purchase such loans to diversify our portfolio. The primary risks of one-to-four family loans include the borrower’s inability to pay, material decreases in the value of the real estate that is being held as collateral and significant increases in interest rates, which may make loans unprofitable. • Construction and land - We originate loans for the construction of one-to-four family and multi-family residences and CRE properties in our market area. We concentrate our efforts on single homes and small infill projects in established neighborhoods where there is not abundant land available for development. Construction loans are considered to have higher risks due to construction completion and timing risk, and the ultimate repayment being sensitive to interest rate changes, government regulation of real property and the availability of long-term financing. Additionally, economic conditions may impact the Company’s ability to recover its investment in construction loans, as adverse economic conditions may negatively impact the real estate market, which could affect the borrower’s ability to complete and sell the project. Additionally, the fair value of the underlying collateral may fluctuate as market conditions change. We occasionally originate land loans located predominantly in California for the purpose of facilitating the ultimate construction of a home or commercial building. The primary risks include the borrower’s inability to pay and the inability of the Company to recover its investment due to a decline in the fair value of the underlying collateral. • Consumer loans - In addition to consumer loans acquired through our various bank acquisitions, we originate a limited number of consumer loans, generally for banking customers only, which consist primarily of home equity lines of credit, savings account secured loans and auto loans. Repayment of these loans is dependent on the borrower’s ability to pay and the fair value of the underlying collateral. Various regulatory agencies, as an integral part of their examination process, periodically review the Company’s ALLL and loan review process. Such agencies may require the Company to recognize additions to the allowance based on judgments different from those of management. In the opinion of management, and in accordance with the credit loss allowance methodology, the present allowance is considered adequate to absorb probable incurred credit losses as of the date of these consolidated financial statements. Additions and reductions to the allowance are reflected in current operations. Charge-offs recorded against the allowance, for all loan segments, are made when specific loans are considered uncollectible or are transferred to other real estate owned and the fair value of the property is less than the Company’s recorded investment in the loan. Recoveries of amounts previously charged-off are credited to the allowance. Although management uses the best information available to make these estimates, future adjustments to the allowance may be necessary due to economic, operating, regulatory and other conditions that may extend beyond the Company’s control. Purchased Credit Impaired Loans. As part of business acquisitions, the Bank acquires certain loans that have shown evidence of credit deterioration since origination, referred to as purchased credit impaired loans. These loans are recorded at the fair value, such that no ALLL for purchase credit impaired (“PCI”) is established upon their acquisition. The Company has elected to account for such loans individually. The Company estimates the amount and timing of expected cash flows for each purchased loan, and the expected cash flows in excess of the fair value is recorded as interest income over the remaining life of the loan and is referred to as the accretable yield. The excess of the loan’s contractual principal and interest over expected cash flows is not recorded and is referred to as the non-accretable difference. Over the life of the loan, expected cash flows continue to be estimated. Subsequent decreases in expected future cash flows beyond the expected cash flows as of the acquisition date are accounted for through a charge to the provision for loan losses. If subsequent reforecasts indicate there has been a probable and significant increase in the level of expected future cash flows, the Company first reduces any previously established ALLL for PCI loans and then accounts for the remainder of the increase through interest income as a yield adjustment. Other Real Estate Owned. Real estate properties acquired through, or in lieu of, loan foreclosure are recorded at fair value, less cost to sell, with any excess loan balance over the fair value of the property charged against the ALLL. The Company obtains an appraisal and/or market valuation on all other real estate owned at the time of possession. After foreclosure, valuations are periodically performed by management. Any subsequent declines in fair value are recorded as a charge to current period earnings with a corresponding write-down to the asset. All legal fees and direct costs, including foreclosure and other related costs are expensed as incurred. Premises and Equipment. Premises and equipment are carried at cost less accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the assets, which range from forty years for buildings, seven years for furniture, fixtures and equipment, and three years for computer and telecommunication equipment. The cost of leasehold improvements is amortized using the straight-line method over the shorter of the estimated useful life of the asset or the term of the related leases. The Company periodically evaluates the recoverability of long-lived assets, such as premises and equipment, to ensure the carrying value has not been impaired. Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell. Securities Sold Under Agreements to Repurchase. The Company enters into sales of securities under agreement to repurchase. These agreements are treated as financing arrangements and, accordingly, the obligations to repurchase the securities sold are reflected as liabilities in the Company’s consolidated financial statements. The securities collateralizing these agreements are delivered to several major national brokerage firms who arranged the transactions. The securities are reflected as assets in the Company’s consolidated financial statements. The brokerage firms may loan such securities to other parties in the normal course of their operations and agree to return the identical security to the Company at the maturity of the agreements. Bank Owned Life Insurance. Bank owned life insurance (“BOLI”) is accounted for using the cash surrender value method and is recorded at its realizable value. Changes in the cash surrender value of BOLI are recorded as a component of noninterest income. Goodwill and Core Deposit Intangible. Goodwill is generally determined as the excess of the fair value of the consideration transferred, plus the fair value of any noncontrolling interests in the acquiree, over the fair value of the net assets acquired and liabilities assumed as of the acquisition date. Goodwill and intangible assets acquired in a purchase business combination and determined to have indefinite useful lives are not amortized, but tested for impairment at least annually or more frequently if events and circumstances exist that indicate the necessity for such impairment tests to be performed. The Company typically performs its annual impairment testing in the fourth quarter. Intangible assets with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Goodwill is the only intangible asset with an indefinite life recorded in the Company’s consolidated balance sheets. Core deposit intangible assets arising from whole bank acquisitions are amortized on either an accelerated basis, reflecting the pattern in which the economic benefits of the intangible asset is consumed or otherwise used up, or on a straight-line amortization method over their estimated useful lives, which ranges from 6 to 11.5 years. Loan Commitments and Related Financial Instruments. Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded. Subordinated Debentures. Long-term borrowings are carried at cost, adjusted for amortization of premiums and accretion of discounts, which are recognized in interest expense using the interest method. Debt issuance costs are recognized in interest expense using the interest method over the life of the instrument. Stock-Based Compensation. The Company issues various forms of stock-based compensation awards annually to officers and directors of the Company, including stock options, restricted stock awards and restricted stock units. The related compensation costs are recognized in the income statement based on the grant-date fair value over the period they are expected to vest, net of estimates for forfeitures. Estimates for forfeitures are based on the Company’s historical experience for each award type. A Black-Scholes model is utilized to estimate the fair value of stock options. The Black-Scholes model uses certain assumptions to determine grant-date fair value such as: expected volatility, expected term of the option, expected risk-free rate of interest and expected dividend yield on the Company’s common stock. The market price of the Company’s common stock at the grant-date is used for restricted stock awards in determining the grant-date fair value for those awards. Restricted stock units are granted to officers of the Company. Restricted stock units are stock-based compensation awards that when ultimately settled, result in the payment of cash or the issuance of shares of the Company’s common stock to the holder of the award. As with other stock-based compensation awards, compensation cost for restricted stock units is recognized over the period in which the awards are expected to vest. Certain of the Company’s restricted stock units contain vesting conditions which are based on pre-determined performance targets. The level at which the associated performance targets are achieved can impact the ultimate settlement of the award with the grantee and thus the level of compensation expense ultimately recognized. Certain of these awards contain a market condition whereby the vesting of the award is based on the Company’s performance, such as total shareholder return, relative to its peers over a specified period of time. The grant date fair value of market based restricted stock units is determined through the use of an independent third party which employs the use of a Monte Carlo simulation. The Monte Carlo simulation estimates grant date fair value using input assumptions similar to those used in the Black-Scholes model, however, it also incorporates into the grant date fair value calculation the probability that the performance targets will be achieved. The grant date fair value of restricted stock units that do not contain a market condition for vesting is based on the price of the Company’s common stock on the grant date. Income Taxes. Deferred tax assets and liabilities are recorded for the expected future tax consequences of events that have been recognized in the Company’s financial statements or tax returns using the asset liability method. In estimating future tax consequences, all expected future events other than enactments of changes in the tax law or rates are considered. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date. Deferred tax assets are to be recognized for temporary differences that will result in deductible amounts in future years and for tax carryforwards if, in the opinion of management, it is more likely than not that the deferred tax assets will be realized. At December 31, 2018, no valuation allowance was deemed necessary against the Company’s deferred tax assets. At December 31, 2017, a valuation allowance of $380,000 was recorded against the capital loss carryover deferred tax asset, as the Company does not believe it will generate sufficient capital gain before the capital loss carryover expires. A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. The Company recognizes interest and / or penalties related to income tax matters in income tax expense. Earnings per Share. Earnings per share of common stock is calculated on both a basic and diluted basis based on the weighted average number of common and common equivalent shares outstanding, excluding common shares in treasury. Basic earnings per share excludes potential dilution and is computed by dividing income available to stockholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted from the issuance of common stock that then would share in earnings. Comprehensive Income. Comprehensive income is reported in addition to net income for all periods presented. Comprehensive income is a more inclusive financial reporting methodology that includes disclosure of other comprehensive income (loss) that historically has not been recognized in the calculation of net income. Unrealized gains and losses on the Company’s available-for-sale investment securities are required to be included in other comp

Regulatory Capital Requirements

Regulatory Capital Requirements and Other Regulatory Matters	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [Abstract]
Regulatory Capital Requirements and Other Regulatory Matters	Regulatory Capital Requirements and Other Regulatory Matters The Company and the Bank are subject to various regulatory capital requirements administered by federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory, and possibly additional discretionary, actions by regulators that, if undertaken, could have a direct material effect on the Company’s and the Bank’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of the Company’s and the Bank’s assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. The Company’s and the Bank’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Quantitative measures established by regulation to ensure capital adequacy require the Bank to maintain capital in order to meet certain capital ratios to be considered adequately capitalized or well capitalized under the regulatory framework for prompt corrective action. As of the most recent formal notification from the Federal Reserve, the Bank was categorized as “well capitalized.” There are no conditions or events since that notification that management believes have changed the Bank’s categorization. Final comprehensive regulatory capital rules for U.S. banking organizations pursuant to the capital framework of the Basel Committee on Banking Supervision, generally referred to as “Basel III”, became effective for the Company and the Bank on January 1, 2015, subject to phase-in periods for certain of their components and other provisions, and fully phased in by January 1, 2019. The most significant of the provisions of the Final Capital Rules, which applied to the Company and the Bank were as follows: the phase-out of trust preferred securities from Tier 1 capital, the higher risk-weighting of high volatility and past due real estate loans and the capital treatment of deferred tax assets and liabilities above certain thresholds. Under the Basel III rules, the Company must hold a capital conservation buffer above the adequately capitalized risk-based capital ratios. The capital conservation buffer increased by 0.625% each year from 0.00% for 2015 to 2.50% in 2019. The capital conservation buffer for 2019 is 2.50% and for 2018 is 1.875% . The net unrealized gain or loss on available-for-sale securities is not included in computing regulatory capital. As defined in applicable regulations and set forth in the table below, which excludes the capital conservation buffer, at December 31, 2018 and 2017 , the Company and the Bank continue to exceed the “well capitalized” standards as well as exceed the Basel III minimum capital ratios of the conservation buffer for each of the risk-based capital ratios: Actual Minimum Required for Capital Adequacy Purposes Required to be Well Capitalized Under Prompt Corrective Action Regulations Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) At December 31, 2018 Pacific Premier Bancorp, Inc. Consolidated Tier 1 Leverage Ratio $ 1,112,132 10.38 % $ 428,751 4.00 % N/A N/A Common Equity Tier 1 to Risk-Weighted Assets 1,087,164 10.88 % 449,505 4.50 % N/A N/A Tier 1 Capital to Risk-Weighted Assets 1,112,132 11.13 % 599,340 6.00 % N/A N/A Total Capital to Risk-Weighted Assets 1,237,315 12.39 % 799,120 8.00 % N/A N/A Pacific Premier Bank Tier 1 Leverage Ratio $ 1,185,544 11.06 % $ 428,703 4.00 % $ 535,879 5.00 % Common Equity Tier 1 to Risk-Weighted Assets 1,185,544 11.87 % 449,481 4.50 % 649,251 6.50 % Tier 1 Capital to Risk-Weighted Assets 1,185,544 11.87 % 599,308 6.00 % 799,078 8.00 % Total Capital to Risk-Weighted Assets 1,226,258 12.28 % 799,078 8.00 % 998,847 10.00 % At December 31, 2017 Pacific Premier Bancorp, Inc. Consolidated Tier 1 Leverage Ratio $ 737,173 10.61 % $ 277,900 4.00 % N/A N/A Common Equity Tier 1 to Risk-Weighted Assets 717,145 10.48 % 307,818 4.50 % N/A N/A Tier 1 Capital to Risk-Weighted Assets 737,173 10.78 % 410,424 6.00 % N/A N/A Total Capital to Risk-Weighted Assets 852,382 12.46 % 547,232 8.00 % N/A N/A Pacific Premier Bank Tier 1 Leverage Ratio $ 805,110 11.59 % $ 277,870 4.00 % $ 347,337 5.00 % Common Equity Tier 1 to Risk-Weighted Assets 805,110 11.77 % 307,742 4.50 % 444,516 6.50 % Tier 1 Capital to Risk-Weighted Assets 805,110 11.77 % 410,322 6.00 % 547,096 8.00 % Total Capital to Risk-Weighted Assets 835,945 12.22 % 547,096 8.00 % 683,870 10.00 %

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The amortized cost and estimated fair value of securities were as follows: December 31, 2018 Amortized Cost Unrealized Gain Unrealized Loss Estimated Fair Value (dollars in thousands) Investment securities available-for-sale: U.S. Treasury $ 59,688 $ 1,224 $ — $ 60,912 Agency 128,958 1,631 (519 ) 130,070 Corporate debt 104,158 291 (906 ) 103,543 Municipal bonds 238,914 1,941 (2,225 ) 238,630 Collateralized mortgage obligation: residential 24,699 64 (425 ) 24,338 Mortgage-backed securities: residential 554,751 1,112 (10,134 ) 545,729 Total investment securities available-for-sale 1,111,168 6,263 (14,209 ) 1,103,222 Investment securities held-to-maturity: Mortgage-backed securities: residential 43,381 148 (686 ) 42,843 Other 1,829 — — 1,829 Total investment securities held-to-maturity 45,210 148 (686 ) 44,672 Total investment securities $ 1,156,378 $ 6,411 $ (14,895 ) $ 1,147,894 December 31, 2017 Amortized Unrealized Unrealized Estimated Cost Gain Loss Fair Value (dollars in thousands) Investment securities available-for-sale: Agency $ 47,051 $ 236 $ (78 ) $ 47,209 Corporate debt 78,155 1,585 (194 ) 79,546 Municipal bonds 228,929 3,942 (743 ) 232,128 Collateralized mortgage obligation: residential 33,984 132 (335 ) 33,781 Mortgage-backed securities: residential 398,664 266 (4,165 ) 394,765 Total investment securities available-for-sale 786,783 6,161 (5,515 ) 787,429 Investment securities held-to-maturity: Mortgage-backed securities: residential 17,153 — (209 ) 16,944 Other 1,138 — — 1,138 Total investment securities held-to-maturity 18,291 — (209 ) 18,082 Total investment securities $ 805,074 $ 6,161 $ (5,724 ) $ 805,511 Unrealized gains and losses on investment securities available-for-sale are recognized in stockholders’ equity as accumulated other comprehensive income or loss. At December 31, 2018 , the Company had accumulated other comprehensive loss of $7.9 million , or $5.6 million net of tax, compared to accumulated other comprehensive income of $646,000 or $415,000 net of tax, at December 31, 2017 . At December 31, 2018 , mortgage-backed securities with an estimated par value of $20.3 million and a fair value of $20.9 million were pledged as collateral for the Bank’s HOA reverse repurchase agreements, which totaled $ 75,000 . The average balance of repurchase agreement facilities was $15.0 million during the year ended December 31, 2018 . At December 31, 2018 and 2017, there were not holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of shareholders’ equity. The Company reviews individual securities classified as available-for-sale to determine whether a decline in fair value below the amortized cost basis is temporary, meaning: (i) those declines were due to interest rate changes and not to a deterioration in the creditworthiness of the issuers of those investment securities, and (ii) we have the ability to hold those securities until there is a recovery in their values or until their maturity. If it is probable that the Company will be unable to collect all amounts due according to contractual terms of the debt security not impaired at acquisition, an other-than-temporary impairment shall be considered to have occurred. If an OTTI occurs, the cost basis of the security will be written down to its fair value as the new cost basis and the write down accounted for as a realized loss. There were no OTTI as of December 31, 2018 and 2017 . As of December 2016, the Company realized OTTI losses net of recoveries of $205,000 . The table below shows the number, fair value and gross unrealized holding losses of the Company’s investment securities by investment category and length of time that the securities have been in a continuous loss position. December 31, 2018 Less than 12 months 12 months or Longer Total Number Fair Value Gross Unrealized Holding Losses Number Fair Value Gross Unrealized Holding Losses Number Fair Value Gross Unrealized Holding Losses (dollars in thousands) Investment securities available-for-sale: Agency 15 26,229 (333 ) 6 10,434 (186 ) 21 36,663 (519 ) Corporate debt 9 47,805 (471 ) 8 19,369 (435 ) 17 67,174 (906 ) Municipal bonds 60 45,083 (369 ) 102 69,693 (1,856 ) 162 114,776 (2,225 ) Collateralized mortgage obligation: residential 1 814 (1 ) 8 18,104 (424 ) 9 18,918 (425 ) Mortgage-backed securities: residential 20 70,839 (435 ) 120 324,864 (9,699 ) 140 395,703 (10,134 ) Total investment securities available-for-sale 105 190,770 (1,609 ) 244 442,464 (12,600 ) 349 633,234 (14,209 ) Investment securities held-to-maturity: Mortgage-backed securities: residential 3 11,256 (81 ) 3 15,741 (605 ) 6 26,997 (686 ) Other — — — — — — — — — Total investment securities held-to-maturity 3 11,256 (81 ) 3 15,741 (605 ) 6 26,997 (686 ) Total investment securities 108 $ 202,026 $ (1,690 ) 247 $ 458,205 $ (13,205 ) 355 $ 660,231 $ (14,895 ) December 31, 2017 Less than 12 months 12 months or Longer Total Number Fair Gross Number Fair Gross Number Fair Gross (dollars in thousands) Investment securities available-for-sale: Agency 6 $ 13,754 $ (78 ) — $ — $ — 6 $ 13,754 $ (78 ) Corporate debt 4 10,079 (64 ) 2 6,076 (130 ) 6 16,155 (194 ) Municipal bonds 103 61,313 (268 ) 30 15,658 (475 ) 133 76,971 (743 ) Collateralized mortgage obligation: residential 5 13,971 (149 ) 3 8,943 (186 ) 8 22,914 (335 ) Mortgage-backed securities: residential 66 220,951 (1,600 ) 41 110,062 (2,565 ) 107 331,013 (4,165 ) Total available-for-sale 184 320,068 (2,159 ) 76 140,739 (3,356 ) 260 460,807 (5,515 ) Investment securities held-to-maturity: Mortgage-backed securities: residential 2 10,745 (133 ) 1 6,198 (76 ) 3 16,943 (209 ) Other — — — — — — — — — Total held-to-maturity 2 10,745 (133 ) 1 6,198 (76 ) 3 16,943 (209 ) Total securities 186 $ 330,813 $ (2,292 ) 77 $ 146,937 $ (3,432 ) 263 $ 477,750 $ (5,724 ) The amortized cost and estimated fair value of investment securities available for sale at December 31, 2018 , by contractual maturity are shown in the table below. One Year or Less More than One Year to Five Years More than Five Years to Ten Years More than Ten Years Total Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value (dollars in thousands) Investment securities available-for-sale: Treasury $ — $ — $ 10,407 $ 10,606 $ 49,281 $ 50,306 $ — $ — $ 59,688 $ 60,912 Agency 992 991 35,103 35,769 74,149 74,926 18,714 18,384 128,958 130,070 Corporate — — — — 104,158 103,543 — — 104,158 103,543 Municipal bonds 5,271 5,264 29,715 29,704 70,354 69,581 133,574 134,081 238,914 238,630 Collateralized mortgage obligation: residential — — — — 815 814 23,884 23,524 24,699 24,338 Mortgage-backed securities: residential — — 1,569 1,527 162,855 161,964 390,327 382,238 554,751 545,729 Total investment securities available-for-sale 6,263 6,255 76,794 77,606 461,612 461,134 566,499 558,227 1,111,168 1,103,222 Investment securities held-to-maturity: Mortgage-backed securities: residential — — 928 942 — — 42,453 41,901 43,381 42,843 Other — — — — — — 1,829 1,829 1,829 1,829 Total investment securities held-to-maturity — — 928 942 — — 44,282 43,730 45,210 44,672 Total investment securities $ 6,263 $ 6,255 $ 77,722 $ 78,548 $ 461,612 $ 461,134 $ 610,781 $ 601,957 $ 1,156,378 $ 1,147,894 During the years ended December 31, 2018 , 2017 and 2016 , the Company recognized gross gains on sales of available-for-sale securities in the amounts of $1.6 million , $3.1 million and $1.8 million , respectively. During the years ended December 31, 2018 , 2017 and 2016 , the Company recognized gross losses on sales of available-for-sale securities in the amounts of $208,000 , $386,000 and $9,000 , respectively. The Company had net proceeds from the sale or maturity/call of available-for-sale securities of $407.0 million , $268.6 million and $230.9 million during the years ended December 31, 2018 , 2017 and 2016 , respectively. FHLB, FRB and other stock At December 31, 2018 , the Company had $19.6 million in FHLB stock, $ 51.5 million in FRB stock and $ 37.7 million in other stock, all carried at cost. During the years ended December 31, 2018 and 2017 , FHLB had repurchased $24.9 million and $10.3 million , respectively, of the Company’s excess FHLB stock through their stock repurchase program. During the year ended December 31, 2016 , FHLB did not repurchase any of the Company’s excess FHLB stock through their stock repurchase program. The Company evaluates its investments in FHLB and other stock for impairment periodically, including their capital adequacy and overall financial condition. No impairment losses have been recorded through December 31, 2018 .

Loans

Loans	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Loans	Loans The following table presents the composition of the loan portfolio as of the dates indicated: For the Years Ended December 31, 2018 2017 (dollars in thousands) Business loans: Commercial and industrial $ 1,364,423 $ 1,086,659 Franchise 765,416 660,414 Commercial owner occupied 1,679,122 1,289,213 SBA 193,882 185,514 Agribusiness 138,519 116,066 Total business loans 4,141,362 3,337,866 Real estate loans: Commercial non-owner occupied 2,003,174 1,243,115 Multi-family 1,535,289 794,384 One-to-four family 356,264 270,894 Construction 523,643 282,811 Farmland 150,502 145,393 Land 46,628 31,233 Total real estate loans 4,615,500 2,767,830 Consumer loans: Consumer loans 89,424 92,931 Gross loans held for investment 8,846,286 6,198,627 Deferred loan origination fees and discounts, net (9,468 ) (2,403 ) Loans held for investment 8,836,818 6,196,224 Allowance for loan losses (36,072 ) (28,936 ) Loans held for investment, net $ 8,800,746 $ 6,167,288 Loans held for sale, at lower of cost or fair value $ 5,719 $ 23,426 The Company originates SBA loans with the intent to sell the guaranteed portion of the loan prior to maturity and, therefore, designates them as held for sale. From time to time, the Company may purchase or sell other types of loans in order to manage concentrations, maximize interest income, change risk profiles, improve returns and generate liquidity. Concentration of Credit Risk The Company’s loan portfolio was collateralized by various forms of real estate and business assets located principally in California, as well as in certain markets in the states of Arizona, Nevada, and Washington where we also have depository offices. The Company’s loan portfolio contains concentrations of credit in commercial non-owner occupied real estate, multi-family real estate and commercial owner occupied business loans. The Company maintains policies approved by the board of directors that address these concentrations and continues to diversify its loan portfolio through loan originations and purchases and sales of loans to meet approved concentration levels. While management believes that the collateral presently securing these loans is adequate, there can be no assurances that significant deterioration in the California real estate market and economy would not expose the Company to significantly greater credit risk. Loans Serviced for Others The Company generally retains the servicing rights of the guaranteed portion of SBA loans sold, for which the Company records a servicing asset at fair value and subsequently accounted for at the lower of cost or market value. At December 31, 2018 and 2017 , the servicing asset total $8.5 million and $8.8 million , respectively, and was included in other assets. Servicing rights are evaluated for impairment based upon the fair value of the rights as compared to the carrying amount. Impairment is recognized through a valuation allowance, to the extent the fair value is less than the carrying amount. At December 31, 2018 , and 2017 , the Company determined that no valuation allowance was necessary. Loans serviced for others are not included in the accompanying consolidated statements of financial condition. The unpaid principal balance of loans and participations serviced for others were $635.3 million December 31, 2018 and $634.5 million at December 31, 2017 . Purchased Credit Impaired Loans The Company has purchased loans through the bank acquisitions, for which there was evidence of deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected. The carrying amount of those loans at December 31, 2018 and 2017 was as follows: For the Years Ended December 31, 2018 2017 (dollars in thousands) Business loans: Commercial and industrial $ 10 $ 3,310 Commercial owner occupied 632 1,262 SBA 1,265 1,802 Total business loans 1,907 6,374 Real estate loans: Commercial non-owner occupied 275 1,650 One-to-four family — 255 Construction — 517 Land — 83 Total real estate loans 275 2,505 Consumer loans: Consumer loans — 10 Total purchase credit impaired $ 2,182 $ 8,889 The following table summarizes the accretable yield on the purchased credit impaired for the years ended December 31, 2018 , 2017 and 2016 : For the Years Ended December 31, 2018 2017 2016 (dollars in thousands) Balance at the beginning of period $ 3,019 $ 3,747 $ 2,726 Additions 1,430 3,102 788 Accretion (532 ) (2,037 ) (1,354 ) Payoffs (1,688 ) (2,125 ) 165 Sales (1,818 ) — — Reclassification from nonaccretable difference — 332 1,422 Balance at the end of period $ 411 $ 3,019 $ 3,747 Impaired Loans The following tables provide a summary of the Company’s investment in impaired loans as of and for the periods indicated: Recorded Investment Unpaid Principal Balance With Specific Allowance Without Specific Allowance Specific Allowance for Impaired Loans Average Recorded Investment Interest Income Recognized (dollars in thousands) December 31, 2018 Business loans Commercial and industrial $ 1,023 $ 1,071 $ 550 $ 473 $ 118 $ 1,173 $ 1 Franchise 189 190 — 189 — 119 — Commercial owner occupied 599 628 — 599 — 1,549 — SBA 2,739 7,598 488 2,251 466 1,814 — Agribusiness 7,500 7,500 — 7,500 — 625 35 Real estate loans Commercial non-owner occupied — — — — — 538 — Multi-family — — — — — 500 — One-to-four family 408 453 — 408 — 1,206 — Land — — — — — 5 — Consumer loans Consumer — — — — — 33 — Totals $ 12,458 $ 17,440 $ 1,038 $ 11,420 $ 584 $ 7,562 $ 36 December 31, 2017 Business loans Commercial and industrial $ 1,160 $ 1,585 $ — $ 1,160 $ — $ 441 $ — Commercial owner occupied 97 98 97 — 55 153 — SBA 1,201 4,329 — 1,201 — 434 — Real estate loans Commercial non-owner occupied — — — — — 86 — One-to-four family 817 849 — 817 — 166 — Construction — — — — — 1,017 — Land 9 35 — 9 — 12 — Totals $ 3,284 $ 6,896 $ 97 $ 3,187 $ 55 $ 2,309 $ — December 31, 2016 Business loans Commercial and industrial $ 250 $ 1,990 $ 250 $ — $ 250 $ 864 $ 76 Franchise — — — — — 1,016 68 Commercial owner occupied 436 847 — 436 — 505 37 SBA 316 3,865 — 316 — 331 23 Real estate loans Commercial non-owner occupied — — — — — 1,072 93 One-to-four family 124 291 — 124 — 226 18 Land 15 36 — 15 — 18 2 Totals $ 1,141 $ 7,029 $ 250 $ 891 $ 250 $ 4,032 $ 317 The Company considers a loan to be impaired when, based on current information and events, it is probable the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement or it is determined that the likelihood of the Company receiving all scheduled payments, including interest, when due is remote. The Company has no commitments to lend additional funds to debtors whose loans have been impaired. The Company reviews loans for impairment when the loan is classified as substandard or worse, delinquent 90 days, determined by management to be collateral dependent, or when the borrower files bankruptcy or is granted a troubled debt restructure. Measurement of impairment is based on the loan’s expected future cash flows discounted at the loan’s effective interest rate, measured by reference to an observable market value, if one exists, or the fair value of the collateral if the loan is deemed collateral dependent. Loans are generally charged-off at the time that the loan is classified as a loss. Valuation allowances are determined on a loan-by-loan basis or by aggregating loans with similar risk characteristics. We sometimes modify or restructure loans when the borrower is experiencing financial difficulties by making a concession to the borrower in the form of changes in the amortization terms, reductions in the interest rates, the acceptance of interest only payments and, in limited cases, concessions to the outstanding loan balances. These loans are classified as troubled debt restructurings (“TDRs”) and considered impaired loans. TDRs are loans modified for the purpose of alleviating temporary impairments to the borrower’s financial condition or cash flows. A workout plan between us and the borrower is designed to provide a bridge for borrower cash flow shortfalls in the near term. A TDR loan may be returned to accrual status when the loan is brought current, has performed in accordance with the contractual restructured terms for a time frame of at least six months, and the ultimate collectability of the total contractual restructured principal and interest in no longer in doubt. At December 31, 2018 , the Company had no recorded investment in a TDR compared to $97,000 at December 31, 2017 . When loans are placed on nonaccrual status, all accrued interest is reversed from current period earnings. Payments received on nonaccrual loans are generally applied as a reduction to the loan principal balance. If the likelihood of further loss is remote, the Company will recognize interest on a cash basis only. Loans may be returned to accruing status if the Company believes that all remaining principal and interest is fully collectible and there has been at least six months of sustained repayment performance since the loan was placed on nonaccrual. The Company does not accrue interest on loans 90 days or more past due or when, in the opinion of management, there is reasonable doubt as to the collection of interest. The Company had impaired loans on nonaccrual status of $4.9 million , $3.3 million and $1.1 million at December 31, 2018 , 2017 and 2016 , respectively. The Company did not record income from the receipt of cash payments related to nonaccruing loans during the years ended December 31, 2018 , 2017 and 2016 . The Company had $213,000 of loans 90 days or more past due and still accruing at December 31, 2018 , all of which were PCI loans. Income recognition for PCI loans is accounted for in accordance with ASC Subtopic 310-30 Receivables -Loans and Debt Securities Acquired with Deteriorated Credit Quality. The Company had $1.8 million in loans 90 days or more past due and still accruing at December 31, 2017 . Credit Quality and Credit Risk The Company’s credit quality is maintained and credit risk managed in two distinct areas. The first is the loan origination process, wherein the Bank underwrites credit and chooses which risks it is willing to accept. The second is in the ongoing oversight of the loan portfolio, where existing credit risk is measured and monitored, and where performance issues are dealt with in a timely and comprehensive fashion. The Company maintains a comprehensive credit policy, which sets forth minimum and maximum tolerances for key elements of loan risk. The policy identifies and sets forth specific guidelines for analyzing each of the loan products the Company offers from both an individual and portfolio wide basis. The credit policy is reviewed annually by the Bank Board. The Bank’s seasoned underwriters and portfolio managers ensure all key risk factors are analyzed with most loan underwriting including a comprehensive global cash flow analysis. Credit risk is monitored and managed within the loan portfolio by the Company’s portfolio managers based on a comprehensive credit and portfolio review policy. This policy requires a program of financial data collection and analysis, comprehensive loan reviews, property and/or business inspections and monitoring of portfolio concentrations and trends. The portfolio managers also monitor asset-based lines of credit, loan covenants and other conditions associated with the Company’s business loans as a means to help identify potential credit risk. Individual loans, excluding the homogeneous loan portfolio, are reviewed at least every two years, and in most cases, more often including the assignment of a risk grade. Risk grades are based on a six -grade Pass scale, P1 - P5 and Watch; along with Special Mention, Substandard, Doubtful and Loss classifications, as such classifications are defined by the federal banking regulatory agencies. The assignment of risk grades allows the Company to, among other things, identify the risk associated with each credit in the portfolio, and to provide a basis for estimating probable incurred losses inherent in the portfolio. Risk grades are reviewed regularly by the Company’s Credit and Portfolio Review committee, and are reviewed annually by an independent third-party, as well as by regulatory agencies during scheduled examinations. The following provides brief definitions for risk grades assigned to loans in the portfolio: • Pass classifications represent assets with a level of credit quality, which contain no well-defined deficiency or weakness. • Special Mention assets do not currently expose the Bank to a sufficient risk to warrant classification in one of the adverse categories, but possess correctable deficiencies or potential weaknesses deserving management’s close attention. • Substandard assets are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. These assets are characterized by the distinct possibility that the Bank will sustain some loss if the deficiencies are not corrected. • Doubtful credits have all the weaknesses inherent in substandard credits, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. • Loss assets are those that are considered uncollectible and of such little value that their continuance as assets is not warranted. Amounts classified as loss are promptly charged off. The portfolio managers also manage loan performance risks, collections, workouts, bankruptcies and foreclosures. Loan performance risks are mitigated by our portfolio managers acting promptly and assertively to address problem credits when they are identified. Collection efforts are commenced immediately upon non-payment, and the portfolio managers seek to promptly determine the appropriate steps to minimize the Company’s risk of loss. When foreclosure will maximize the Company’s recovery for a non-performing loan, the portfolio managers will take appropriate action to initiate the foreclosure process. When a loan is graded as special mention or substandard or doubtful, the Company obtains an updated valuation of the underlying collateral. If the credit in question is also identified as impaired, a valuation allowance, if necessary, is established against such loan or a loss is recognized by a charge to the allowance for loan losses if management believes that the full amount of the Company’s recorded investment in the loan is no longer collectable. The Company typically continues to obtain or confirm updated valuations of underlying collateral for special mention and classified loans on an annual or biannual basis in order to have the most current indication of fair value. Once a loan is identified as impaired, an analysis of the underlying collateral is performed at least quarterly, and corresponding changes in any related valuation allowance are made or balances deemed to be fully uncollectable are charged-off. The following tables stratify the loan portfolio by the Company’s internal risk grading system as well as certain other information concerning the credit quality of the loan portfolio, including loans held for sale, as of the periods indicated: Credit Risk Grades Pass Special Mention Substandard Doubtful Total Gross Loans December 31, 2018 (dollars in thousands) Business loans Commercial and industrial $ 1,340,322 $ 12,005 $ 12,134 $ — $ 1,364,461 Franchise 760,795 4,431 190 — 765,416 Commercial owner occupied 1,660,994 1,580 16,548 — 1,679,122 SBA 189,006 2,289 6,906 — 198,201 Agribusiness 125,355 — 13,164 — 138,519 Real estate loans Commercial non-owner occupied 1,998,118 731 5,687 — 2,004,536 Multi-family 1,530,567 4,060 662 — 1,535,289 One-to-four family 350,083 728 5,453 — 356,264 Construction 523,643 — — — 523,643 Farmland 150,381 — 121 — 150,502 Land 46,008 132 488 — 46,628 Consumer loans Consumer loans 89,321 — 103 — 89,424 Totals $ 8,764,593 $ 25,956 $ 61,456 $ — $ 8,852,005 Credit Risk Grades Pass Special Mention Substandard Doubtful Total Gross Loans December 31, 2017 (dollars in thousands) Business loans Commercial and industrial $ 1,063,452 $ 8,163 $ 15,044 $ — $ 1,086,659 Franchise 660,415 — — — 660,415 Commercial owner occupied 1,273,380 654 21,180 — 1,295,214 SBA 199,468 1 3,469 — 202,938 Warehouse facilities 108,143 4,079 3,844 — 116,066 Real estate loans Commercial non-owner occupied 1,242,045 — 1,070 — 1,243,115 Multi-family 794,156 — 228 — 794,384 One-to-four family 268,776 154 1,964 — 270,894 Construction 282,294 517 — — 282,811 Farmland 144,234 44 1,115 — 145,393 Land 30,979 — 254 — 31,233 Consumer loans Consumer loans 92,794 — 137 — 92,931 Totals $ 6,160,136 $ 13,612 $ 48,305 $ — $ 6,222,053 Days Past Due Current 30-59 60-89 90+ Total Gross Loans Non-accruing December 31, 2018 (dollars in thousands) Business loans Commercial and industrial $ 1,362,017 $ 309 $ 1,204 $ 931 $ 1,364,461 $ 931 Franchise 759,546 5,680 — 190 765,416 190 Commercial owner occupied 1,677,967 343 — 812 1,679,122 599 SBA 195,051 524 — 2,626 198,201 2,739 Agribusiness 138,519 — — — 138,519 — Real estate loans Commercial non-owner occupied 2,004,536 — — — 2,004,536 — Multi-family 1,535,275 14 — — 1,535,289 — One-to-four family 356,219 30 9 6 356,264 398 Construction 523,643 — — — 523,643 — Farmland 150,502 — — — 150,502 — Land 46,628 — — — 46,628 — Consumer loans Consumer loans 89,249 146 29 — 89,424 — Totals $ 8,839,152 $ 7,046 $ 1,242 $ 4,565 $ 8,852,005 $ 4,857 Days Past Due Current 30-59 60-89 90+ Total Gross Loans Non-accruing December 31, 2017 (dollars in thousands) Business loans Commercial and industrial $ 1,085,770 $ 84 $ 570 $ 235 $ 1,086,659 $ 1,160 Franchise 660,415 — — — 660,415 — Commercial owner occupied 1,291,254 3,474 486 — 1,295,214 97 SBA 200,821 177 — 1,940 202,938 1,201 Warehouse facilities 116,066 — — — 116,066 — Real estate loans Commercial non-owner occupied 1,243,115 — — — 1,243,115 — Multi-family 792,603 1,781 — — 794,384 — One-to-four family 269,725 354 — 815 270,894 817 Construction 282,811 — — — 282,811 — Farmland 145,393 — — — 145,393 — Land 31,141 83 — 9 31,233 9 Consumer loans Consumer loans 92,880 11 — 40 92,931 — Totals $ 6,211,994 $ 5,964 $ 1,056 $ 3,039 $ 6,222,053 $ 3,284

Allowance for Loan Losses

Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2018
Provision for Loan and Lease Losses [Abstract]
Allowance for Loan Losses	Allowance for Loan Losses The Company’s ALLL covers estimated credit losses on individually evaluated loans that are determined to be impaired as well as estimated probable incurred losses inherent in the remainder of the loan portfolio. The ALLL is prepared using the information provided by the Company’s credit review process together with data from peer institutions and economic information gathered from published sources. The loan portfolio is segmented into groups of loans with similar risk characteristics. Each segment possesses varying degrees of risk based on, among other things, the type of loan, the type of collateral, and the sensitivity of the borrower or industry to changes in external factors such as economic conditions. An estimated loss rate calculated using the Company’s historical loss rates adjusted for current portfolio trends, economic conditions, and other relevant internal and external factors, is applied to each group’s aggregate loan balances. The Company’s base ALLL factors are determined by management using the Bank’s annualized actual trailing charge-off data over a full credit cycle with an approximate average loss emergence period of 1.4 years. Potential adjustments to those base factors are made for relevant internal and external factors. Those factors may include: • Changes in lending policies and procedures, including underwriting standards and collection, charge-offs, and recovery practices; • Changes in the nature and volume of the loan portfolio , as well as new types of lending; • Changes in the experience, ability, and depth of lending management and other relevant staff that may have an impact on our loan portfolio; • Changes in the volume and severity of adversely classified or graded loans; • Changes in the quality of our loan review system and the management oversight; • The existence and effect of any concentrations of credit and changes in the level of such concentrations; • Changes in national, regional and local economic conditions, including trends in real estate values and the interest rate environment; • Changes in the value of the underlying collateral for collateral-dependent loans; and The effect of external factors, such as competition, legal developments and regulatory requirements on the level of estimated credit losses in our current loan portfolio For loans risk graded as watch or worse, progressively higher potential loss factors are applied based on migration analysis of risk grading and net charge-offs. The following tables summarize the allocation of the allowance as well as the activity in the allowance attributed to various segments in the loan portfolio as of and for the periods indicated: Commercial and Industrial Franchise Commercial Owner Occupied SBA Agribusiness Warehouse Facilities Commercial Non-owner Occupied Multi-family One-to-four Family Construction Farmland Land Consumer Loans Total (dollars in thousands) Balance, December 31, 2017 $ 9,721 $ 5,797 $ 767 $ 2,890 $ 1,291 $ — $ 1,266 $ 607 $ 803 $ 4,569 $ 137 $ 993 $ 95 $ 28,936 Charge-offs (1,411 ) — (33 ) (102 ) — — — — — — — — (409 ) (1,955 ) Recoveries 698 — 47 169 — — — — 13 — — — 8 935 Provisions for (reduction in) loan losses 1,813 703 605 1,331 1,992 — 338 118 (11 ) 597 366 (221 ) 525 8,156 Balance, December 31, 2018 $ 10,821 $ 6,500 $ 1,386 $ 4,288 $ 3,283 $ — $ 1,604 $ 725 $ 805 $ 5,166 $ 503 $ 772 $ 219 $ 36,072 Amount of allowance attributed to: Specifically evaluated impaired loans $ 118 $ — $ — $ 466 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ 584 General portfolio allocation 10,703 6,500 1,386 3,822 3,283 — 1,604 725 805 5,166 503 772 219 35,488 Loans individually evaluated for impairment 1,023 189 599 2,739 7,500 — — — 408 — — — — 12,458 Specific reserves to total loans individually evaluated for impairment 11.53 % — % — % 17.01 % — % — % — % — % — % — % — % — % — % 4.69 % Loans collectively evaluated for impairment $ 1,363,400 $ 765,227 $ 1,678,523 $ 191,143 $ 131,019 $ — $ 2,003,174 $ 1,535,289 $ 355,856 $ 523,643 $ 150,502 $ 46,628 $ 89,424 $ 8,833,828 General reserves to total loans collectively evaluated for impairment 0.79 % 0.85 % 0.08 % 2.00 % 2.51 % — % 0.08 % 0.05 % 0.23 % 0.99 % 0.33 % 1.66 % 0.24 % 0.40 % Total gross loans $ 1,364,423 $ 765,416 $ 1,679,122 $ 193,882 $ 138,519 $ — $ 2,003,174 $ 1,535,289 $ 356,264 $ 523,643 $ 150,502 $ 46,628 $ 89,424 $ 8,846,286 Total allowance to gross loans 0.79 % 0.85 % 0.08 % 2.21 % 2.37 % — % 0.08 % 0.05 % 0.23 % 0.99 % 0.33 % 1.66 % 0.24 % 0.41 % Commercial and Industrial Franchise Commercial Owner Occupied SBA Agribusiness Warehouse Facilities Commercial Non-owner Occupied Multi-family One-to-four Family Construction Farmland Land Consumer Loans Total (dollars in thousands) Balance, December 31, 2016 $ 6,362 $ 3,845 $ 1,193 $ 1,039 $ — $ — $ 1,715 $ 2,927 $ 365 $ 3,632 $ — $ 198 $ 20 $ 21,296 Charge-offs (1,344 ) — — (8 ) — — — — (10 ) — — — — (1,362 ) Recoveries 94 — 105 127 — — — — 35 — — — 1 362 Provisions for (reduction in) loan losses 4,609 1,952 (531 ) 1,732 1,291 — (449 ) (2,320 ) 413 937 137 795 74 8,640 Balance, December 31, 2017 $ 9,721 $ 5,797 $ 767 $ 2,890 $ 1,291 $ — $ 1,266 $ 607 $ 803 $ 4,569 $ 137 $ 993 $ 95 $ 28,936 Amount of allowance attributed to: Specifically evaluated impaired loans $ — $ — $ 55 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ 55 General portfolio allocation 9,721 5,797 712 2,890 1,291 — 1,266 607 803 4,569 137 993 95 28,881 Loans individually evaluated for impairment 1,160 — 97 1,201 — — — — 817 — — 9 — 3,284 Specific reserves to total loans individually evaluated for impairment — % — % 56.70 % — % — % — % — % — % — % — % — % — % — % 1.67 % Loans collectively evaluated for impairment $ 1,085,499 $ 660,414 $ 1,289,116 $ 184,313 $ 116,066 $ — $ 1,243,115 $ 794,384 $ 270,077 $ 282,811 $ 145,393 $ 31,224 $ 92,931 $ 6,195,343 General reserves to total loans collectively evaluated for impairment 0.90 % 0.88 % 0.06 % 1.57 % 1.11 % — % 0.10 % 0.08 % 0.30 % 1.62 % 0.09 % 3.18 % 0.10 % 0.47 % Total gross loans $ 1,086,659 $ 660,414 $ 1,289,213 $ 185,514 $ 116,066 $ — $ 1,243,115 $ 794,384 $ 270,894 $ 282,811 $ 145,393 $ 31,233 $ 92,931 $ 6,198,627 Total allowance to gross loans 0.89 % 0.88 % 0.06 % 1.56 % 1.11 % — % 0.10 % 0.08 % 0.30 % 1.62 % 0.09 % 3.18 % 0.10 % 0.47 % Commercial Franchise Commercial SBA Agribusiness Warehouse Facilities Commercial Multi-family One-to-four Construction Farmland Land Consumer Loans Total Balance, December 31, 2015 $ 3,449 $ 3,124 $ 1,870 $ 1,500 $ — $ 759 $ 2,048 $ 1,583 $ 698 $ 2,030 $ — $ 233 $ 23 $ 17,317 Charge-offs (2,802 ) (980 ) (329 ) (980 ) — — — — (151 ) — — — — (5,242 ) Recoveries 177 — 25 193 — — 21 — 25 — — — 4 445 Provisions for (reduction in) loan losses 5,538 1,701 (373 ) 326 — (759 ) (354 ) 1,344 (207 ) 1,602 — (35 ) (7 ) 8,776 Balance, December 31, 2016 $ 6,362 $ 3,845 $ 1,193 $ 1,039 $ — $ — $ 1,715 $ 2,927 $ 365 $ 3,632 $ — $ 198 $ 20 $ 21,296 Amount of allowance attributed to: Specifically evaluated impaired loans $ 250 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ 250 General portfolio allocation 6,112 3,845 1,193 1,039 — — 1,715 2,927 365 3,632 — 198 20 21,046 Loans individually evaluated for impairment 250 — 436 316 — — — — 124 — — 15 — 1,141 Specific reserves to total loans individually evaluated for impairment 100.00 % — % — % — % — % — % — % — % — % — % — % — % — % 21.91 % Loans collectively evaluated for impairment $ 562,919 $ 459,421 $ 454,482 $ 88,678 $ — $ — $ 586,975 $ 690,955 $ 100,327 $ 269,159 $ — $ 19,814 $ 4,112 $ 3,236,842 General reserves to total loans collectively evaluated for impairment 1.09 % 0.84 % 0.26 % 1.17 % — % — % 0.29 % 0.42 % 0.36 % 1.35 % — % 1.00 % 0.49 % 0.65 % Total gross loans $ 563,169 $ 459,421 $ 454,918 $ 88,994 $ — $ — $ 586,975 $ 690,955 $ 100,451 $ 269,159 $ — $ 19,829 $ 4,112 $ 3,237,983 Total allowance to gross loans 1.13 % 0.84 % 0.26 % 1.17 % — % — % 0.29 % 0.42 % 0.36 % 1.35 % — % 1.00 % 0.49 % 0.66 %

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2018
Other Real Estate [Abstract]
Other Real Estate Owned	Other Real Estate Owned Other real estate owned was $147,000 at December 31, 2018 , $326,000 at December 31, 2017 and $460,000 at December 31, 2016 . The following summarizes the activity in the other real estate owned for the years ended December 31: 2018 2017 2016 (dollars in thousands) Balance, beginning of year $ 326 $ 460 $ 1,161 Additions: Acquisitions 524 326 197 Foreclosures 15 — — Sales (1,055 ) (507 ) (577 ) Gain (loss) on sale 346 47 18 Write downs (9 ) — (339 ) Balance, end of year $ 147 $ 326 $ 460 The Company had no consumer mortgage loans collateralized by residential real estate property for which formal foreclosure proceedings were in process as of December 31, 2018 , compared to $73,000 as of December 31, 2017 .

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment The Company’s premises and equipment consisted of the following at December 31: 2018 2017 (dollars in thousands) Land $ 18,902 $ 16,920 Premises 25,361 19,868 Leasehold improvements 15,824 14,025 Furniture, fixtures and equipment 28,994 20,480 Automobiles 173 187 Subtotal 89,254 71,480 Less: accumulated depreciation 24,563 18,325 Total $ 64,691 $ 53,155 Depreciation expense for premises and equipment was $7.7 million for 2018 , $4.9 million for 2017 and $2.9 million for 2016 .

Goodwill and Core Deposit Intan

Goodwill and Core Deposit Intangibles	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Core Deposit Intangibles	Goodwill and Core Deposit Intangibles At December 31, 2018 , the Company had goodwill of $808.7 million . Additions to goodwill in 2018 includes $313.0 million due to the acquisition Grandpoint and adjustments to goodwill in the amount of $1.8 million for Plaza Bank and $600,000 for Heritage Oaks Bank during the one-year measurement period subsequent to acquisition date. The following table presents changes in the carrying value of goodwill for the periods indicated: 2018 2017 2016 (dollars in thousands) Balance, beginning of year $ 493,329 $ 102,490 $ 50,832 Goodwill acquired during the year 313,043 390,839 51,658 Purchase Accounting Adjustments 2,354 — — Impairment losses — — — Balance, end of year $ 808,726 $ 493,329 $ 102,490 Accumulated impairment losses at end of year $ — $ — $ — The Company’s goodwill was evaluated for impairment during the fourth quarter of 2018 , with no impairment loss recognition considered necessary. At December 31, 2018 , the Company had $100.6 million of CDI. Additions to CDI of $71.1 million were primarily due to the acquisition Grandpoint. The Company’s change in the gross amount of core deposit intangibles and the related accumulated amortization consisted of the following at December 31: 2018 2017 2016 (dollars in thousands) Gross amount of CDI: Balance, beginning of year $ 54,809 $ 15,102 $ 10,782 Additions due to acquisitions 71,136 39,707 4,320 Balance, end of year 125,945 54,809 15,102 Accumulated amortization: Balance, beginning of year (11,795 ) (5,651 ) (3,612 ) Amortization (13,594 ) (6,144 ) (2,039 ) Balance, end of year (25,389 ) (11,795 ) (5,651 ) Net CDI, end of year $ 100,556 $ 43,014 $ 9,451 The estimated aggregate amortization expense related to our core deposit intangible assets for each of the next five years, in order from the present, is $17.2 million , $15.4 million , $13.4 million , $11.7 million , and $10.2 million . The Company’s core deposit intangibles is evaluated for impairment, if events and circumstances indicate possible impairment. Factors that may attribute to impairment include customer attrition and run-off. Management is unaware of any events and/or circumstances that would indicate a possible impairment to the core deposit intangibles.

Bank Owned Life Insurance

Bank Owned Life Insurance	12 Months Ended
	Dec. 31, 2018
Investments, All Other Investments [Abstract]
Bank Owned Life Insurance	Bank Owned Life Insurance At December 31, 2018 and 2017 , the Company had $110.9 million and $76.0 million , respectively of BOLI. The Company recorded noninterest income associated with the BOLI policies of $3.4 million , $2.3 million and $1.4 million for the years ending December 31, 2018 , 2017 and 2016 , respectively. BOLI involves the purchasing of life insurance by the Company on a select group of employees where the Company is the owner and beneficiary of the policies. BOLI is recorded as an asset at its cash surrender value. Increases in the cash surrender value of these policies, as well as a portion of the insurance proceeds received, are recorded in noninterest income and are not subject to income tax, as long as they are held for the life of the covered parties.

Qualified Affordable Housing Pr

Qualified Affordable Housing Project Investments	12 Months Ended
	Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Qualified Affordable Housing Project Investments	Qualified Affordable Housing Project Investments The Company’s investment in Qualified Affordable Housing Funds that generate Low Income Housing Tax Credits at December 31, 2018 and 2017 was $39.4 million and $11.6 million , respectively, recorded in other assets. Total unfunded commitments related to the investments in qualified affordable housing funds totaled $13.4 million and $1.3 million at December 31, 2018 and 2017 , respectively. The Company has invested in five separate LIHTC funds, which provide the Company with CRA credit. Additionally, the investment in LIHTC funds provide the Company with tax credits and with operating loss tax benefits over an approximately 10 year period. None of the original investment will be repaid. The investments in the WNC Institutional Tax Credit funds are being accounted for using the cost method, under which the Company amortizes as non-interest expense the initial cost of the investment equally over the expected time period in which tax credits and other tax benefits will be received. The investments in the Sycamore Court, R4 CA Housing and Cypress Cove funds qualify for and are being accounted for using the proportional amortization method, which allows for the amortization of the investments to be in proportion to the total of the tax credits and other tax benefits that are allocated to the investor. The tax credits and operating loss tax benefits are recognized in the income statement as a component of income tax expense (benefit) for all LIHTC funds. The following table presents the Company’s original investment in the LIHTC funds, the current recorded investment balance, and the unfunded liability balance of each investment at December 31, 2018 and 2017 . In addition, the table reflects the tax credits and tax benefits recorded by the Company during 2018 and 2017 , the amortization of the investment and the net impact to the Company’s income tax provision for 2018 and 2017 . Original Investment Value Current Recorded Investment Unfunded Liability Obligation Tax Credits and Tax Deductions (1) Amortization of Investments (2) Net Income Tax Benefit December 31, 2018 (dollars in thousands) WNC Institutional Tax Credit $ 5,000 $ 2,250 $ — $ 715 $ 500 $ (675 ) WNC Institutional Tax Credit 5,000 2,750 136 786 500 (703 ) Sycamore Court 6,181 4,580 927 1,141 1,003 (766 ) R4 CA Housing 15,000 13,426 9,405 4,721 1,574 (1,950 ) Cypress Cove 20,000 16,401 2,914 1,621 997 (1,113 ) Total - Investments in $ 51,181 $ 39,407 $ 13,382 $ 8,984 $ 4,574 $ (5,207 ) Original Investment Value Current Recorded Investment Unfunded Liability Obligation Tax Credits and Tax Deductions (1) Amortization of Investments (2) Net Income Tax Benefit December 31, 2017 WNC Institutional Tax Credit $ 5,000 $ 2,750 $ 85 $ 455 $ 500 $ (663 ) WNC Institutional Tax Credit 5,000 3,250 288 482 500 (690 ) Sycamore Court 6,181 5,582 927 1,577 599 (782 ) Total - Investments in $ 16,181 $ 11,582 $ 1,300 $ 2,514 $ 1,599 $ (2,135 ) (1) The amounts reflected in this column represent both the tax credits, as well as the tax benefits generated by the Qualified Affordable Housing Projects operating loss for the year, which are included in the calculation of income tax expense. (2) This amount represents the amortization of the investment cost of the LIHTC.

Deposit Accounts

Deposit Accounts	12 Months Ended
	Dec. 31, 2018
Deposits [Abstract]
Deposit Accounts	Deposit Accounts Deposit accounts and weighted average interest rates consisted of the following at December 31: 2018 Weighted 2017 Weighted (dollars in thousands) Transaction accounts Noninterest-bearing checking $ 3,495,737 — % $ 2,226,876 — % Interest-bearing checking 526,088 0.38 % 365,193 0.13 % Money market 2,975,578 0.89 % 2,181,571 0.48 % Savings 250,271 0.14 % 227,436 0.13 % Total transaction accounts 7,247,674 0.37 % 5,001,076 0.21 % Certificates of deposit accounts 250,000 or less 569,877 1.44 % 562,147 0.96 % Greater than $250,000 840,800 2.12 % 522,663 1.26 % Total certificates of deposit accounts 1,410,677 1.84 % 1,084,810 1.10 % Total deposits $ 8,658,351 0.63 % $ 6,085,886 0.33 % The aggregate annual maturities of certificates of deposit accounts at December 31, 2018 are as follows: 2018 Balance Weighted Average Interest Rate (dollars in thousands) Within 3 months $ 479,572 1.88 % 4 to 6 months 365,578 2.03 % 7 to 12 months 264,838 1.68 % 13 to 24 months 179,590 1.92 % 25 to 36 months 43,103 2.01 % 37 to 60 months 13,380 1.74 % Over 60 months 64,616 0.92 % Total $ 1,410,677 1.84 % Interest expense on deposit accounts for the years ended December 31 is summarized as follows: 2018 2017 2016 (dollars in thousands) Checking accounts $ 1,167 $ 365 $ 200 Money market accounts 19,567 6,720 3,641 Savings 357 251 151 Certificates of deposit accounts 16,562 6,035 4,399 Total $ 37,653 $ 13,371 $ 8,391 Accrued interest on deposits, which is included in accrued expenses and other liabilities, was $1,742,000 at December 31, 2018 and $526,000 at December 31, 2017 .

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances and Other Borrowings	12 Months Ended
	Dec. 31, 2018
Long-term Federal Home Loan Bank Advances [Abstract]
Federal Home Loan Bank Advances and Other Borrowings	Federal Home Loan Bank Advances and Other Borrowings As of December 31, 2018 , the Company has a line of credit with the FHLB that provides for advances totaling up to 45% of the Company’s assets, equating to a credit line of $5.18 billion , of which $1.78 billion was available for borrowing. The available for borrowing was based on collateral pledged by real estate loans with an aggregate balance of $3.30 billion . At December 31, 2018 , the Company had $506.0 million in overnight FHLB advances and $161.5 million term advances, compared to $310.0 million in overnight FHLB advances and $180.0 million term advances at December 31, 2017 . The term advance have maturity dates ranging from January 2019 to June of 2022 and rates ranging from 1.53% to 2.73% . The following table summarizes activities in advances from the FHLB for the periods indicated: Year Ended December 31, 2018 2017 (dollars in thousands) Average balance outstanding $ 529,278 $ 290,839 Maximum amount outstanding at any month-end during the year 883,612 490,148 Balance outstanding at end of year 667,606 490,148 Weighted average interest rate during the year 2.51 % 1.19 % At December 31, 2018 and December 31, 2017 , the Company had an uncollateralized and unused repurchase facility with Union Bank of $50.0 million . The Company had Bank-related credit facilities with Citigroup and Barclays Bank at December 31, 2017 . The outstanding credit facilities were secured by pledged MBS with an estimated fair value of $27.3 million . At December 31, 2017, the Company had borrowings of $18.5 million with Citigroup that matured in September of 2018, $10.0 million with Barclays Bank that matured in February of 2018. The Company did not renew these credit facilities. The Company sells certain securities under agreements to repurchase. The agreements are treated as overnight borrowings with the obligations to repurchase securities sold reflected as a liability. The dollar amount of investment securities underlying the agreements remain in the asset accounts. The Company enters into these debt agreements as a service to certain HOA depositors to add protection for deposit amounts above FDIC insurance levels. At December 31, 2018 , the Company sold securities under agreement to repurchase of $75,000 with weighted average rate of 0.01% and collateralized by investment securities with fair value of approximately $20.9 million . The average balance of repurchase agreement facilities was $15.0 million during the year ended December 31, 2018 . At December 31, 2018 , the Bank had unsecured lines of credit with eight correspondent banks for a total amount of $168.0 million and access through the Federal Reserve discount window to borrow $3.3 million . At December 31, 2018 and December 31, 2017 , the Company had no outstanding balances against these lines. In addition, the Corporation acquired a line of credit with Wells Fargo Bank in June of 2017, with availability of $15.0 million . The line, which matures in June 2019, was added to provide an additional source of liquidity at the Corporation level and has no outstanding balance at December 31, 2018 and December 31, 2017. The following table summarizes activities in other borrowings for the periods indicated: Year Ended December 31, 2018 2017 (dollars in thousands) Average balance outstanding $ 29,193 $ 50,866 Maximum amount outstanding at any month-end during the year 52,091 52,996 Balance outstanding at end of year 75 46,139 Weighted average interest rate during the year 0.01 % 1.86 %

Subordinated Debentures

Subordinated Debentures	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Subordinated Debentures	Subordinated Debentures In August 2014, the Corporation issued $60.0 million in aggregate principal amount of 5.75% Subordinated Notes Due 2024 (the “Notes”) in a private placement transaction to institutional accredited investors (the “Private Placement”). The Corporation contributed $50.0 million of net proceeds from the Private Placement to the Bank to support general corporate purposes. The Notes bear interest at an annual fixed rate of 5.75% , with the first interest payment on the Notes occurring on March 3, 2015, and interest to be paid semiannually each March 3 and September 3 through September 3, 2024. At December 31, 2018 , the carrying value of the Notes was $59.3 million , net of unamortized debt issuance costs of $688 thousand . The Notes can only be redeemed, in whole or in part, prior to the maturity date if the notes do not constitute Tier 2 Capital (for purposes of capital adequacy guidelines of the Board of Governors of the Federal Reserve). As of December 31, 2018 , the Notes qualify as Tier 2 Capital. Principal and interest are due upon early redemption. In connection with the Private Placement, the Corporation obtained ratings from Kroll Bond Rating Agency (“KBRA”). KBRA assigned investment grade ratings of BBB+ and BBB for the Corporation’s senior unsecured debt and subordinated debt, respectively, and a deposit rating of A- for the Bank. The Company’s and Bank’s ratings were reaffirmed in October 2018 by KBRA. In March 2004, the Corporation issued $10.3 million in Floating Rate Junior Subordinated Deferrable Interest Debentures (the “Subordinated Debentures”) to PPBI Trust I, a statutory trust created under the laws of the State of Delaware. The Debt Securities are subordinated to effectively all borrowings of the Corporation and are due and payable on April 6, 2034. Interest is payable quarterly on the Subordinated Debentures at three-month LIBOR plus 2.75% per annum, for an effective rate of 5.19% as of December 31, 2018 . The Subordinated Debentures may be redeemed, in part or whole, on or after April 7, 2009 at the option of the Corporation, at par. The Subordinated Debentures can also be redeemed at par if certain events occur that impact the tax treatment or the capital treatment of the issuance. The Corporation also purchased a 3% minority interest totaling $310,000 in PPBI Trust I. The balance of the equity of PPBI Trust I is comprised of mandatorily redeemable preferred securities (“Trust Preferred Securities”) and is included in other assets. PPBI Trust I sold $10.0 million of Trust Preferred Securities to investors in a private offering. On April 1, 2017, as part of the HEOP acquisition, the Corporation assumed $5.2 million of floating rate junior subordinated debt securities associated with Heritage Oaks Capital Trust II. Interest is payable quarterly at three-month LIBOR plus 1.72% per annum, for an effective rate of 4.12% per annum as of December 31, 2018 . At December 31, 2018 , the carrying value of these debentures was $4.0 million , which reflects purchase accounting fair value adjustments of $1.3 million . The Corporation also assumed $3.1 million and $5.2 million of floating rate junior subordinated debt associated with Mission Community Capital Trust I and Santa Lucia Bancorp (CA) Capital Trust, respectively. At December 31, 2018 , the carrying value of Mission Community Capital Trust I and Santa Lucia Bancorp (CA) Capital Trust were $2.8 million and $3.8 million , respectively, which reflects purchase accounting fair value adjustments of $306,000 and $1.3 million , respectively. Interest is payable quarterly at three-month LIBOR plus 2.95% per annum, for an effective rate of 5.39% per annum as of December 31, 2018 for Mission Community Capital Trust I. Interest is payable quarterly at three-month LIBOR plus 1.48% per annum, for an effective rate of 3.92% per annum as of December 31, 2018 for Santa Lucia Bancorp (CA) Capital Trust. These three debentures are callable by the Corporation at par. On November 1, 2017, as part of the PLZZ acquisition, the Company assumed three subordinated notes totaling $25.0 million at a fixed interest rate of 7.125% payable in arrears on a quarterly basis. The notes have a maturity date of June 26, 2025 and are also redeemable in whole, or in part, from time to time beginning in June 26, 2020 at an amount equal to 103.0% of principal plus accrued unpaid interest. The redemption price decreases 50 basis points each subsequent year. At December 31, 2018 , the carrying value of these subordinated notes was $25.2 million , which reflects purchase accounting fair value adjustments of $157,000 . On July 1, 2018, as part of the Grandpoint acquisition, the Corporation assumed $5.2 million of floating rate junior subordinated debt securities associated with First Commerce Bancorp Statutory Trust I. Interest is payable quarterly at three-month LIBOR plus 2.95% per annum, for an effective rate of 5.74% per annum as of December 31, 2018 . At December 31, 2018 , the carrying value of these debentures was $4.9 million , which reflects purchase accounting fair value adjustments of $224,000 . The Corporation is not allowed to consolidate any trust preferred securities into the Company’s consolidated financial statements. The resulting effect on the Company’s consolidated financial statements is to report only the Subordinated Debentures as a component of the Company’s liabilities. The following table summarizes activities for our subordinated debentures for the periods indicated: Year Ended December 31, 2018 2017 (dollars in thousands) Average balance outstanding $ 107,732 $ 81,466 Maximum amount outstanding at any month-end during the year 110,313 105,123 Balance outstanding at end of year 110,313 105,123 Weighted average interest rate during the year 6.23 % 5.80 %

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income taxes for the years ended December 31 consisted of the following: 2018 2017 2016 (dollars in thousands) Current income tax provision: Federal $ 19,787 $ 18,644 $ 16,928 State 13,178 7,062 4,655 Total current income tax provision 32,965 25,706 21,583 Deferred income tax provision (benefit): Federal 8,142 8,294 2,379 Effect of Tax Act (1,441 ) 5,633 — State 2,574 2,493 1,253 Total deferred income tax provision (benefit) 9,275 16,420 3,632 Total income tax provision $ 42,240 $ 42,126 $ 25,215 A reconciliation from statutory federal income taxes, which are based on a statutory rate of 21% for 2018 and 35% for 2017 and 2016 , to the Company’s effective income taxes for the years ended December 31 is as follows: 2018 2017 2016 (dollars in thousands) Statutory federal income tax provision $ 34,803 $ 35,778 $ 22,863 State taxes, net of federal income tax effect 12,724 6,720 4,135 Cash surrender life insurance (582 ) (645 ) (407 ) Tax exempt interest (1,135 ) (1,660 ) (764 ) Merger costs 375 824 533 LIHTC investments (761 ) (1,031 ) (909 ) Effect of the Tax Act (1,441 ) 5,633 — Excess tax benefit of stock-based compensation (1,811 ) (1,995 ) — Prior year true-up — (1,108 ) — Other 68 (390 ) (236 ) Total income tax provision $ 42,240 $ 42,126 $ 25,215 Deferred tax assets (liabilities) were comprised of the following temporary differences between the financial statement carrying amounts and the tax basis of assets at December 31: 2018 2017 2016 (dollars in thousands) Deferred tax assets: Accrued expenses $ 3,239 $ 2,463 $ 2,839 Net operating loss 6,115 4,834 3,977 Allowance for loan losses, net of bad debt charge-offs 10,709 8,400 8,061 Deferred compensation 3,649 3,074 2,348 State taxes 2,707 1,500 1,879 Depreciation — — 1,090 Loan discount 17,677 8,642 3,477 Stock-based compensation 3,234 1,914 1,108 Unrealized loss on available for sale securities 2,308 — 1,939 Capital loss carryover — 380 — AMT credit 96 107 — Total deferred tax assets 49,734 31,314 26,718 Deferred tax liabilities: Deferred FDIC gain (364 ) (524 ) (1,675 ) Core deposit intangibles (27,388 ) (11,691 ) (3,331 ) Loan origination costs (4,760 ) (3,368 ) (4,208 ) Depreciation (1,192 ) (699 ) — Unrealized gain on available for sale securities — (188 ) — Other (403 ) (1,199 ) (697 ) Total deferred tax liabilities (34,107 ) (17,669 ) (9,911 ) Valuation allowance — (380 ) — Net deferred tax asset $ 15,627 $ 13,265 $ 16,807 On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (“Tax Act”). Among other changes, the Tax Act reduces the U.S. federal corporate tax rate from 35% to 21%. The Company performed an initial assessment and reasonably estimated the effects of the Tax Act on its deferred tax amounts to be approximately $5.6 million , which was recorded as a charge to income tax expense in the fourth quarter of 2017, in accordance with SEC Staff Accounting Bulletin No. 118 (“SAB 118”). As required by SAB 118, the Company continued to reassess and refine the effects of the Tax Act on its deferred tax amounts during 2018. As a result, the Company recorded an income tax benefit of $1.4 million during the year ended December 31, 2018. As of December 31, 2018, the Company has completed the accounting for the income tax effects of the Tax Act. The Company accounts for income taxes by recognizing deferred tax assets and liabilities based upon temporary differences between the amounts for financial reporting purposes and tax basis of its assets and liabilities. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion, or all, of the deferred tax asset will not be realized. In assessing the realization of deferred tax assets, management evaluates both positive and negative evidence, including the existence of any cumulative losses in the current year and the prior two years, the forecasts of future income, applicable tax planning strategies, and assessments of current and future economic and business conditions. This analysis is updated quarterly and adjusted as necessary. Based on the analysis, the Company has determined that a valuation allowance for deferred tax assets was not required as of December 31, 2016 and December 31, 2018 . As of December 31, 2017 , the Company recorded a valuation allowance of $380,000 against the capital loss carryover deferred tax asset, as the Company does not believe it will generate sufficient capital gain before the capital loss carryover expires. Section 382 of the Internal Revenue Code imposes limitations on a corporation’s ability to use any net unrealized built in losses and other tax attributes, such as net operating loss and tax credit carryforwards, when it undergoes a 50% ownership change over a designated testing period. The Company has a Section 382 limited net operating loss carry forward of approximately $25.7 million for federal income tax purposes, which is scheduled to expire in 2026. In addition, the Company has a Section 382 limited net operating loss carry forward of approximately $8.9 million for California franchise tax purposes, which is scheduled to expire in 2020. The Company is expected to fully utilize the federal and California net operating loss carryforward before it expires with the application of the Section 382 annual limitation. The Company and its subsidiaries are subject to U.S. Federal income tax as well as income and franchise tax in multiple state jurisdictions. The statute of limitations related to the consolidated Federal income tax returns is closed for all tax years up to and including 2013. The expiration of the statute of limitations related to the various state income and franchise tax returns varies by state. The Company is currently not under examination in any taxing jurisdiction. A reconciliation of the beginning and ending amount of unrecognized tax benefits for the years ended December 31, 2018 and 2017 is as follows: 2018 2017 (dollars in thousands) Balance at January 1, $ 2,906 $ — Additions based on tax positions related to prior years — 2,906 Balance at December 31, $ 2,906 $ 2,906 The total amount of unrecognized tax benefits was $2.9 million and $2.9 million at December 31, 2018 and 2017 , respectively, and is primarily comprised of unrecognized tax benefits from an acquisition during 2017. The total amount of tax benefits that, if recognized, would favorably impact the effective tax rate was $0 at December 31, 2018 . The Company does not believe that the unrecognized tax benefits will change within the next twelve months. The Company recognizes interest and penalties accrued related to unrecognized tax benefits in income tax expense. The Company had accrued for $246,000 and $104,000 of the interest and penalties at December 31, 2018 and 2017 , respectively.

Commitments, Contingencies and

Commitments, Contingencies and Concentrations of Risk	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies and Concentrations of Risk	Commitments, Contingencies and Concentrations of Risk Lease Commitments – The Company leases a portion of its facilities from non-affiliates under operating leases expiring at various dates through 2028 . The following schedule shows the minimum annual lease payments, excluding any renewals and extensions, property taxes, and other operating expenses, due under these agreements: Year ending December 31, Amount (dollars in thousands) 2019 $ 11,468 2020 10,869 2021 10,133 2022 9,296 2023 8,124 Thereafter 10,518 Total $ 60,408 Rental expense under all operating leases totaled $9.2 million for 2018 , $4.8 million for 2017 , and $4.4 million for 2016 . Legal Proceedings –-The Company is not involved in any material pending legal proceedings other than legal proceedings occurring in the ordinary course of business. Management believes that none of these legal proceedings, individually or in the aggregate, will have a material adverse impact on the results of operations or financial condition of the Company. Employment Agreements— The Company has entered into a three -year employment agreement with its Chief Executive Officer (“CEO”). This agreement provides for the payment of a base salary, a bonus based upon the CEO’s individual performance and the Company’s overall performance, provides a vehicle for the CEO’s use, and provides for the payment of severance benefits upon termination under specified circumstances. Additionally, the Bank has entered into three -year employment agreements with each of the following executive officers: the Bank’s President and Chief Operating Officer, the Chief Credit Officer and Chief Innovation Officer. The agreements provide for the payment of a base salary, a bonus based upon the individual’s performance and the overall performance of the Bank, and the payment of severance benefits upon termination under specified circumstances. Availability of Funding Sources. The Company funds substantially all of the loans thatit originates or purchases through deposits, internally generated funds and/or borrowings. The Company competes for deposits primarily on the basis of rates, and, as a consequence, the Company could experience difficulties in attracting deposits to fund its operations if the Company does not continue to offer deposit rates at levels that are competitive with other financial institutions. To the extent that the Company is not able to maintain its currently available funding sources or to access new funding sources, it would have to curtail its loan production activities or sell loans and investment securities earlier than is optimal. Any such event could have a material adverse effect on the Company’s results of operations, financial condition and cash flows.

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Benefit Plans	Benefit Plans 401(k) Plan. The Bank maintains an Employee Savings Plan (the “401(k) Plan”) which qualifies under Section 401(k) of the Internal Revenue Code. Under the 401(k) Plan, employees may contribute from 1% to 100% of their compensation, up to the dollar limit imposed by the IRS for tax purposes. In 2018 , 2017 and 2016 , the Bank matched 100% of contributions for the first three percent contributed and 50% on the next two percent contributed. Contributions made to the 401(k) Plan by the Bank amounted to $2.5 million for 2018 , $1.4 million for 2017 , and $959,000 for 2016 . Pacific Premier Bancorp, Inc. 2004 Long-Term Incentive Plan (the “2004 Plan”). The 2004 Plan was approved by the Corporation’s stockholders in May 2004. The 2004 Plan authorized the granting of incentive stock options, nonstatutory stock options, stock appreciation rights and restricted stock (collectively “Awards”) equal to 525,500 shares of the common stock of the Corporation for issuances to executive, key employees, officers and directors. The 2004 Plan was in effect for a period of ten years starting in February 25, 2004, the date the 2004 Plan was adopted. Awards granted under the 2004 Plan were made at an exercise price equal to the fair market value of the stock on the date of grant. The Awards granted pursuant to the 2004 Plan vest at a rate of 33.3% per year. The 2004 Plan terminated in February 2014. Heritage Oaks Bancorp, Inc. 2005 Equity Based Compensation Plan (the “2005 Plan”). The 2005 Plan was acquired from Heritage Oaks Bancorp, Inc. on April 1, 2017. The 2005 Plan authorized the granting of Incentive Stock Options, Non-Qualified Stock Options, Stock Appreciation Rights, Restricted Stock Awards, Restricted Stock Units and Performance Share Cash Only Awards. As of December 31, 2016, no further grants can be made from this plan, however, Pacific Premier assumed all unvested and unexercised awards. Pacific Premier Bancorp, Inc. 2012 Long-Term Incentive Plan (the “2012 Plan”) — The 2012 Plan was approved by the Corporation’s stockholders in May 2012. The 2012 Plan authorizes the granting of Awards equal to 620,000 shares of the common stock of the Corporation for issuances to executives, key employees, officers, and directors. The 2012 Plan will be in effect for a period of ten years from May 30, 2012, the date the 2012 Plan was adopted. Awards granted under the 2012 Plan will be made at an exercise price equal to the fair market value of the stock on the date of grant. Awards granted to officers and employees may include incentive stock options, non-qualified stock options, restricted stock, restricted stock units, and stock appreciation rights. The awards have vesting periods ranging from one to three years, where such vesting may occur in either three equal annual installments or one lump sum at the end of the third year. In May 2014, the Corporation’s stockholders approved an amendment to the 2012 Plan to increase the shares available under the plan by 800,000 shares to total 1,420,000 shares. In May 2015, the Corporation’s stockholders approved an amendment to the 2012 Plan to permit the grant of performance-based awards, including equity compensation awards that may not be subject to the deduction limitation of Section 162(m) of the Internal Revenue Code. The performance-based awards include (i) both performance-based equity compensation awards and performance-based cash bonus payments and (ii) restricted stock units. In May 2017, the Corporation’s stockholders approved an amendment to the 2012 Plan to increase the shares available under the plan by 3,580,000 shares to total 5,000,000 shares. Heritage Oaks Bancorp, Inc. 2015 Equity Based Compensation Plan (the “2015 Plan”). The 2015 Plan was acquired from Heritage Oaks Bancorp, Inc. on April 1, 2017. The 2015 plan was approved by the Corporation’s stockholders in May 2015. The 2015 Plan authorized the Company to grant various types of share-based compensation awards to the Company’s employees and Board of Directors such as stock options, restricted stock awards, and restricted stock units. Under the 2015 Equity Incentive Plan a maximum of 2,500,000 shares of the Company’s common stock were made to be issued. Shares issued under this plan, other than stock options and stock appreciation rights, were counted against the plan on a two shares for every one share actually issued basis. Awards that were canceled, expired, forfeited, fail to vest, or otherwise resulted in issued shares not being delivered to the grantee, were made available for the issuance of future share-based compensation awards. Additionally, under this plan, no one individual was to be granted shares in aggregate that exceed more than 250,000 shares during any calendar year. The 2015 Plan is still active and Pacific Premier assumed all unvested and unexercised awards. The Pacific Premier Bancorp, Inc. 2004 Long-Term Incentive Plan, Heritages Oaks Bancorp, Inc. 2005 Equity Based Compensation Plan, Pacific Premier Bancorp, Inc. 2012 Long-Term Incentive Plan and the Heritage Oaks Bancorp, Inc. 2015 Equity Based Compensation Plan are collectively the “Plans.” Stock Options As of December 31, 2018 , there are 40,105 options outstanding on the 2004 Plan with zero available for grant. As of December 31, 2018 , there are 35,950 options outstanding on the 2005 Plan with zero available for grant. As of December 31, 2018 , there are 578,063 options outstanding on the 2012 Plan with 3,272,558 available for grant. As of December 31, 2018 , there are 27,815 options outstanding on the 2015 Plan with 652,866 available for grant. Below is a summary of the stock option activity in the Plans for the year ended December 31, 2018 : 2018 Number of Stock Options Outstanding Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Term Aggregate Intrinsic value (in years) (dollars in thousands) Outstanding at January 1, 2018 954,523 $ 13.89 Granted — — Exercised (255,178 ) 9.71 Forfeited and Expired (17,412 ) 21.53 Outstanding at December 31, 2018 681,933 $ 15.26 5.26 $ 6,962 Vested and Exercisable at December 31, 2018 635,396 $ 15.11 5.04 $ 6,715 The total intrinsic value of options exercised during the years ended December 31, 2018 , 2017 and 2016 was $8.4 million , $7.7 million and $2.0 million , respectively. The amount charged against compensation expense in relation to the stock options was $571,000 for 2018 , $927,000 for 2017 and $883,000 for 2016 . At December 31, 2018 , unrecognized compensation expense related to the options is approximately $134,000 . Restricted Stock Awards and Restricted Stock Units Below is a summary of the restricted stock activity in the Plans for the years ended December 31, 2018 : 2018 Shares Weighted Average Grant-Date Fair Value per share Unvested at the beginning of the year 446,843 $ 29.61 Granted 328,358 41.92 Vested (125,038 ) 28.53 Forfeited (14,086 ) 38.18 Unvested at the end of the year 636,077 $ 35.98 Compensation expense for the year ended December 31, 2018 , 2017 and 2016 related to the above restricted stock grants amounted to $8.5 million , $5.0 million and $2.0 million , respectively. Restricted stock awards and units are valued at the closing stock price on the date of grant and are expensed to stock based compensation expense over the period for which the related service is performed. The total grant date fair value of awards was $12.8 million for 2018 awards. At December 31, 2018 , unrecognized compensation expense related to restricted stock award and units is approximately $13.0 million , which expected to be recognized over a weighted-average period of 1.92 years . Other Plans Salary Continuation Plan. The Bank implemented a non-qualified supplemental retirement plan in 2006 (the “Salary Continuation Plan”) for certain executive officers of the Bank. The Salary Continuation Plan is unfunded. Deferred Compensation Plans. The Bank implemented a non-qualified supplemental retirement plan in 2006 (the “Supplemental Executive Retirement Plan” or “SERP”) for certain executive officers of the Bank. The Bank has acquired additional SERPs through the acquisitions of San Diego Trust Bank (“SDTB”), Independence Bank (“IDPK”) and HEOP. The SERP is unfunded. The expense incurred for the SERP for each of the last three years was $827,000 , $721,000 and $573,000 resulting in a deferred compensation liability of $10.9 million and $8.3 million as of the years ended 2018 and 2017 . In addition, with the acquisition of PLZZ, the Company acquired a deferred compensation plan that is unfunded and results in a deferred compensation asset and liability both in the amount of $1.6 million and $2.0 million as of the years ended 2018 and 2017. The amounts expensed in 2018 , 2017 and 2016 for all of these plans amounted to $827,000 , $721,000 and $573,000 respectively. As of December 31, 2018 , 2017 and 2016 , $10.9 million , $8.4 million , and $5.7 million , respectively, were recorded in other liabilities on the consolidated statements of condition for each of these plans.

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk	12 Months Ended
	Dec. 31, 2018
Risks and Uncertainties [Abstract]
Financial Instruments with Off-Balance Sheet Risk	Financial Instruments with Off-Balance Sheet Risk The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit in the form of originating loans or providing funds under existing lines or letters of credit. These commitments are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates and may require payment of a fee. Since many commitments are expected to expire, the total commitment amounts do not necessarily represent future cash requirements. Commitments involve, to varying degrees, elements of credit and interest rate risk in excess of the amounts recognized in the accompanying consolidated statements of financial condition. The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit is represented by the contractual or notional amount of those instruments. The Company controls credit risk of its commitments to fund loans through credit approvals, limits and monitoring procedures. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. The Company evaluates each customer for creditworthiness. The Company receives collateral to support commitments when deemed necessary. The most significant categories of collateral include real estate properties underlying mortgage loans, liens on personal property and cash on deposit with the Bank. The Company maintains an allowance for credit losses to provide for commitments related to loans associated with undisbursed loan funds and unused lines of credit. The allowance for these commitments was $4.6 million at December 31, 2018 and $1.9 million at December 31, 2017 . The change in the allowance for credit losses for unfunded commitments during the year ended December 31, 2018 was attributable to $2.6 million in fair value adjustments associated unfunded loan commitments and unused lines of credit assumed through the acquisitions of Grandpoint and HEOP. These fair value adjustments were made within the one-year measurement period associated with each acquisition and are attributed to the fair value of unfunded loan commitments and unused lines of credit assumed at the acquisition date. The Company’s commitments to extend credit at December 31, 2018 were $1.8 billion and $1.2 billion at December 31, 2017 . The 2018 balance is primarily composed of $ 1.1 billion of undisbursed commitments for C&I loans.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments The fair value of an asset or liability is the exchange price that would be received to sell that asset or paid to transfer that liability (exit price) in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach, and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. ASC Topic 825 requires disclosure of the fair value of financial assets and financial liabilities, including both those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis and a non-recurring basis. The methodologies for estimating the fair value of financial assets and financial liabilities that are measured at fair value, and for estimating the fair value of financial assets and financial liabilities not recorded at fair value, are discussed below. In accordance with accounting guidance, the Company groups its financial assets and financial liabilities measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described as follows: Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 2 - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, prepayment speeds, volatilities, etc.) or model-based valuation techniques where all significant assumptions are observable, either directly or indirectly, in the market. Level 3 - Valuation is generated from model-based techniques where one or more significant inputs are not observable, either directly or indirectly, in the market. These unobservable assumptions reflect the Company’s own estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques may include use of matrix pricing, discounted cash flow models, and similar techniques. Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with precision. Changes in assumptions could significantly affect the fair values presented. Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent limitations in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates presented herein are not necessarily indicative of the amounts the Company could have realized in a sales transaction at December 31, 2018 and December 31, 2017 . A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Management maximizes the use of observable inputs and attempts to minimize the use of unobservable inputs when determining fair value measurements. Estimated fair values are disclosed for financial instruments for which it is practicable to estimate fair value. These estimates are made at a specific point in time based on relevant market data and information about the financial instruments. These estimates do not reflect any premium or discount that could result from offering the Company’s entire holdings of a particular financial instrument for sale at one time, nor do they attempt to estimate the value of anticipated future business related to the instruments. In addition, the tax ramifications related to the realization of unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in any of these estimates. The following is a description of both the general and specific valuation methodologies used for certain instruments measured at fair value, as well as the general classification of these instruments pursuant to the valuation hierarchy. Investment securities. Investment securities are generally valued based upon quotes obtained from an independent third-party pricing service, which uses evaluated pricing applications and model processes. Observable market inputs, such as, benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data are considered as part of the evaluation. The inputs are related directly to the security being evaluated, or indirectly to a similarly situated security. Market assumptions and market data are utilized in the valuation models. The Company reviews the market prices provided by the third-party pricing service for reasonableness based on the Company’s understanding of the market place and credit issues related to the securities. The Company has not made any adjustments to the market quotes provided by them and, accordingly, the Company categorized its investment portfolio within Level 2 of the fair value hierarchy. Impaired Loans and Other Real Estate Owned. A loan is considered impaired when it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement. Impairment is measured based on the fair value of the underlying collateral or the discounted expected future cash flows. The Company measures impairment on all non-accrual loans for which it has reduced the principal balance to the value of the underlying collateral less the anticipated selling cost. As such, the Company records impaired loans as Level 3. At December 31, 2018 , substantially all the Company’s impaired loans were evaluated based on the fair value of their underlying collateral based upon the most recent appraisal available to management and has recorded a specific reserve on one loan in the amount of $584,000 with a principal balance of $1.0 million . The fair value of impaired loans and other real estate owned were determined using Level 3 assumptions, and represents impaired loan and other real estate owned balances for which a specific reserve has been established or on which a write down has been taken. Generally, the Company obtains third party appraisals (or property valuations) and/or collateral audits in conjunction with internal analysis based on historical experience on its impaired loans and other real estate owned to determine fair value. In determining the net realizable value of the underlying collateral for impaired loans, the Company will then discount the valuation to cover both market price fluctuations and selling costs the Company expected would be incurred in the event of foreclosure. In addition to the discounts taken, the Company’s calculation of net realizable value considered any other senior liens in place on the underlying collateral. The fair value estimates presented herein are based on pertinent information available to management as of the dates indicated, representing an exit price. At December 31, 2018 Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value (dollars in thousands) Assets: Cash and cash equivalents $ 203,406 $ 203,406 $ — $ — $ 203,406 Interest-bearing time deposits with financial institutions 6,143 6,143 — — 6,143 Investments held to maturity 45,210 — 44,672 — 44,672 Investment securities available-for-sale 1,103,222 — 1,103,222 — 1,103,222 Loans held for sale 5,719 — 6,072 — 6,072 Loans held for investment, net 8,836,818 — — 8,697,594 8,697,594 Derivative asset 1,929 — 1,681 — 1,681 Accrued interest receivable 37,837 37,837 — — 37,837 Liabilities: Deposit accounts 8,658,351 7,247,673 1,403,524 — 8,651,197 FHLB advances 667,606 — 666,864 — 666,864 Other borrowings 75 — 75 — 75 Subordinated debentures 110,313 — 115,613 — 115,613 Derivative liability 1,929 — 1,681 — 1,681 Accrued interest payable 3,255 3,255 — — 3,255 At December 31, 2017 Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value (dollars in thousands) Assets: Cash and cash equivalents $ 197,164 $ 197,164 $ — $ — $ 197,164 Interest-bearing time deposits with financial institutions 6,633 6,633 — — 6,633 Investments held to maturity 18,291 — 18,082 — 18,082 Investment securities available for sale 787,429 — 787,429 — 787,429 Loans held for sale 23,426 — 23,524 — 23,524 Loans held for investment, net (1) 6,167,532 — — 6,269,366 6,269,366 Derivative asset 1,135 — 1,135 — 1,135 Accrued interest receivable 27,053 27,053 — — 27,053 Liabilities: Deposit accounts 6,085,868 5,001,053 1,074,564 — 6,075,617 FHLB advances 490,148 — 489,823 — 489,823 Other borrowings 46,139 — 46,373 — 46,373 Subordinated debentures 105,123 — 115,159 — 115,159 Derivative liability 1,135 — 1,135 — 1,135 Accrued interest payable 2,131 2,131 — — 2,131 (1) The estimated fair value of loans held for investment, net for December 31, 2017 is not based on an exit price assumption. A loan is considered impaired when it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement. Impairment is measured based on the fair value of the underlying collateral or the discounted expected future cash flows. The Company measures impairment on all non-accrual loans for which it has reduced the principal balance to the value of the underlying collateral less the anticipated selling cost. As such, the Company records impaired loans as non-recurring Level 3 when the fair value of the underlying collateral is based on an observable market price or current appraised value. When current market prices are not available or the Company determines that the fair value of the underlying collateral is further impaired below appraised values, the Company records impaired loans as Level 3. At December 31, 2018 , substantially all the Company’s impaired loans were evaluated based on the fair value of their underlying collateral based upon the most recent appraisal available to management. The measures of fair value on a non-recurring basis are immaterial at December 31, 2018 and 2017 . The following fair value hierarchy tables present information about the Company’s assets measured at fair value on a recurring basis at the dates indicated: At December 31, 2018 Fair Value Measurement Using Level 1 Level 2 Level 3 Securities at Fair Value (dollars in thousands) Financial assets Investment securities available for sale: U.S. Treasury $ — $ 60,912 $ — $ 60,912 Agency $ — $ 130,070 $ — $ 130,070 Corporate — 103,543 — 103,543 Municipal bonds — 238,630 — 238,630 Collateralized mortgage obligation: residential — 24,338 — 24,338 Mortgage-backed securities: residential — 545,729 — 545,729 Total securities available for sale: $ — $ 1,103,222 $ — $ 1,103,222 Derivative assets $ — $ 1,681 $ — $ 1,681 Financial liabilities Derivative liabilities $ — $ 1,681 $ — $ 1,681 At December 31, 2017 Fair Value Measurement Using Level 1 Level 2 Level 3 Securities at Fair Value (dollars in thousands) Financial assets Investment securities available for sale: Agency $ — $ 47,209 $ — $ 47,209 Corporate $ — $ 79,546 $ — $ 79,546 Municipal bonds — 232,128 — 232,128 Collateralized mortgage obligation: residential — 33,781 — 33,781 Mortgage-backed securities: residential — 394,765 — 394,765 Total securities available for sale: $ — $ 787,429 $ — $ 787,429 Derivative assets $ — $ 1,135 $ — $ 1,135 Financial liabilities Derivative liabilities $ — $ 1,135 $ — $ 1,135 The Company’s valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes the Company’s valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Earnings per share of common stock is calculated on both a basic and diluted basis based on the weighted average number of common and common equivalent shares outstanding, excluding common shares in treasury. Basic earnings per share excludes potential dilution and is computed by dividing income available to stockholders by the weighted average number of common shares outstanding for the period. The Company has no outstanding unvested share-based payment awards that contain rights to nonforfeitable dividends that would be considered participating securities for the basic calculation. Diluted earnings per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted from the issuance of common stock that then would share in earnings and excludes common shares in treasury. Stock options exercisable for shares of common stock are excluded from the computation of diluted earnings per share if they are anti-dilutive due to their exercise price exceeding the average market price during the period. The impact of stock options, which are anti-dilutive are excluded from the computations of diluted earnings per share. The dilutive impact of these securities could be included in future computations of diluted earnings per share if the market price of the common stock increases. There are no anti-dilutive stock options at December 31, 2018 . The weighted average number of stock options excluded was for 17,524 for December 31, 2017 and 82,760 for December 31, 2016 . A reconciliation of the numerators and denominators used in basic and diluted earnings per share computations is presented in the table below. Income/(Loss) (numerator) Shares (denominator) Per Share Amount (dollars in thousands, except share data) For the year ended December 31, 2018: Net income applicable to earnings per share $ 123,340 Basic earnings per share: Income available to common stockholders 123,340 53,963,047 $ 2.29 Effect of dilutive securities: Warrants and stock option plans — 650,010 Diluted earnings per share: Income available to common stockholders $ 123,340 54,613,057 $ 2.26 For the year ended December 31, 2017: Net income applicable to earnings per share $ 60,100 Basic earnings per share: Income available to common stockholders 60,100 37,705,556 $ 1.59 Effect of dilutive securities: Warrants and stock option plans — 805,705 Diluted earnings per share: Income available to common stockholders $ 60,100 38,511,261 $ 1.56 For the year ended December 31, 2016: Net income applicable to earnings per share $ 40,103 Basic earnings per share: Income available to common stockholders 40,103 26,931,634 $ 1.49 Effect of dilutive securities: Warrants and stock option plans — 507,525 Diluted earnings per share: Income available to common stockholders $ 40,103 27,439,159 $ 1.46

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments From time to time, the Company enters into interest rate swap agreements with certain borrowers to assist them in mitigating their interest rate risk exposure associated with the loans they have with the Company. At the same time, the Company enters into identical interest rate swap agreements with another financial institution to mitigate the Company’s interest rate risk exposure associated with the swap agreements it enters into with its borrowers. At December 31, 2018 , the Company had swaps with matched terms with an aggregate notional amount of $57.5 million and a fair value of $1.7 million . The fair values of these swaps are recorded as components of other assets and other liabilities in the Company’s condensed consolidated balance sheet. Changes in the fair value of these swaps, which occur due to changes in interest rates, are recorded in the Company’s income statement as a component of noninterest income. Since the terms of the swap agreements between the Company and its borrowers have been matched with the terms of swap agreements with another financial institution, the adjustments for the change in their fair value offset each other and net to zero in non-interest income. Although changes in the fair value of swap agreements between the Company and borrowers and the Company and other financial institutions offset each other, changes in the credit risk of these counterparties may result in a difference in the fair value of these swap agreements. Offsetting swap agreements the Company has with other financial institutions are collateralized with cash, and swap agreements with borrowers are secured by the collateral arrangements for the underlying loans these borrowers have with the Company. During the twelve months ended December 31, 2018 , there were no losses recorded on swap agreements, attributable to the change in credit risk associated with a counterparty. All interest rate swap agreements entered into by the Company as of December 31, 2018 are not designated as hedging instruments. The following tables summarize the Company’s derivative instruments, included in “other assets” and “other liabilities” in the consolidated statements of financial condition. The Company’s derivative instruments were acquired as part of the 2017 HEOP acquisition, and the Company did not have any at December 31, 2016: December 31, 2018 Derivative Assets Derivative Liabilities Notional Fair Value Notional Fair Value (dollars in thousands) Derivative instruments not designated as hedging instruments: Interest rate swap contracts $ 57,502 $ 1,681 $ 57,502 $ 1,681 Total derivative instruments $ 57,502 $ 1,681 $ 57,502 $ 1,681 December 31, 2017 Derivative Assets Derivative Liabilities Notional Fair Value Notional Fair Value (dollars in thousands) Derivative instruments not designated as hedging instruments: Interest rate swap contracts $ 58,599 $ 1,135 $ 58,599 $ 1,135 Total derivative instruments $ 58,599 $ 1,135 $ 58,599 $ 1,135

Balance Sheet Offsetting

Balance Sheet Offsetting	12 Months Ended
	Dec. 31, 2018
Offsetting [Abstract]
Balance Sheet Offsetting	Balance Sheet Offsetting Derivative financial instruments may be eligible for offset in the consolidated balance sheets, such as those subject to enforceable master netting arrangements or a similar agreement. Under these agreements, the Company has the right to net settle multiple contracts with the same counterparty. The Company offers an interest rate swap product to qualified customers, which are then paired with derivative contracts the Company enters into with a counterparty bank. While derivative contracts entered into with counterparty banks may be subject to enforceable master netting agreements, derivative contracts with customers may not be subject to enforceable master netting arrangements. Financial instruments that are eligible for offset in the consolidated statements of financial condition as of December 31, 2018 are presented in the table below: December 31, 2018 Gross Amounts Not Offset in the Consolidated Gross Amounts Recognized in the Consolidated Balance Sheets Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts Presented in the Consolidated Balance Sheets Financial Instruments Cash Collateral (1) Net Amount (dollars in thousands) Financial assets: Derivatives not designated as $ 2,177 $ (496 ) $ 1,681 $ — $ — $ 1,681 Total $ 2,177 $ (496 ) $ 1,681 $ — $ — $ 1,681 Financial liabilities: Derivatives not designated as $ 1,681 $ — $ 1,681 $ — $ — $ 1,681 Total $ 1,681 $ — $ 1,681 $ — $ — $ 1,681 (1) Represents cash collateral held with counterparty bank. December 31, 2017 Gross Amounts Not Offset in the Consolidated Gross Amounts Recognized in the Consolidated Balance Sheets Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts Presented in the Consolidated Balance Sheets Financial Instruments Cash Collateral (1) Net Amount (dollars in thousands) Financial assets: Derivatives not designated as $ 1,833 $ (698 ) $ 1,135 $ — $ — $ 1,135 Total $ 1,833 $ (698 ) $ 1,135 $ — $ — $ 1,135 Financial liabilities: Derivatives not designated as $ 1,135 $ — $ 1,135 $ — $ — $ 1,135 Total $ 1,135 $ — $ 1,135 $ — $ — $ 1,135 (1) Represents cash collateral held with counterparty bank.

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition The Company earns revenue from a variety of sources. The Company’s principal source of revenue is interest income on loans, investment securities and other interest earning assets, while the remainder of the Company’s revenue is earned from a variety of fees, service charges, gains and losses, and other income, all of which are classified as noninterest income. Revenue from interest on loans and investment securities is accounted for on an accrual basis using the interest method, while revenue from other sources is accounted for under other applicable U.S. GAAP as well as ASC 606 - Revenue from Contracts with Customers. Revenue streams within the scope of and accounted for under ASC 606 include: service charges and fees on deposit accounts, debit card interchange fees, fees from other services the Company provides its customers and gains and losses from the sale of other real estate owned and property, premises and equipment. ASC 606 requires revenue to be recognized when the Company satisfies the related performance obligations by transferring to the customer a good or service. The recognition of revenue under ASC 606 requires the Company to first identify the contract with the customer, identify the associated performance obligations, determine the transaction price, allocate the transaction price to the performance obligations and finally recognize revenue when the performance obligations have been satisfied and the good or service has been transferred. The majority of the Company’s contracts with customers associated with revenue streams that are within the scope of ASC 606 are considered short-term in nature and can be canceled at any time by the customer or the Company without penalty, such as a deposit account agreement. These revenue streams are included in non-interest income. The following table provides a summary of the Company’s revenue streams, including those that are within the scope of ASC 606 and those that are accounted for under other applicable U.S. GAAP: For the Years ended December 31, 2018 2017 2016 Within Scope (1) Out of Scope (2) Within Scope (1) Out of Scope (2) Within Scope (1) Out of Scope (2) (dollars in thousands) Interest income: Loans $ — $ 415,410 $ — $ 251,027 $ — $ 157,935 Investment securities and other interest-earning assets — 33,013 — 18,978 — 8,670 Total interest income — 448,423 — 270,005 — 166,605 Noninterest income: Loan servicing fees — 1,445 — 787 — 1,032 Service charges on deposit accounts 5,128 — 3,273 — 1,459 — Other service fee income 902 — 1,847 — 1,516 — Debit card interchange income 4,326 — 2,043 — 267 — Earnings on bank-owned life insurance — 3,427 — 2,279 — 1,353 Net gain from sales of loans — 10,759 — 12,468 — 9,539 Net gain from sales of investment securities — 1,399 — 2,737 — 1,797 Other income 1,242 2,399 491 5,189 449 2,190 Total noninterest income 11,598 19,429 7,654 23,460 3,691 15,911 Total revenues $ 11,598 $ 467,852 $ 7,654 $ 293,465 $ 3,691 $ 182,516 ______________________________ (1) Revenues from contracts with customers accounted for under ASC 606. (2) Revenues not within the scope of ASC 606 and accounted for under other applicable U.S. GAAP requirements. The following provides information concerning the major components of the Company’s revenue: Interest Income. Interest income is comprised of interest on loans, investment securities and other interest-earning assets. Interest is recognized using the interest method, which reflects the contractual yield on loans and coupon yield for investment securities. These yields are adjusted for purchase discounts, premiums and net deferred loan origination fees for newly originated loans. Loan Servicing Fees. Loan servicing fees generally consist of fees related to servicing of loans for others, as well as the net impact of related serving asset amortization. ASC 606 stipulates that income streams generated through the transfer and servicing of financial instruments shall be accounted for under ASC 860 - Transfers and Servicing and is therefore excluded from the scope of ASC 606. Service Charges on Deposit Accounts and Other Service Fee Income. Service charges on deposit accounts and other service fee income consists of periodic service charges on deposit accounts and transaction based fees such as those related to overdrafts, ATM charges and wire transfer fees. The majority of these revenues are accounted for under ASC 606. Performance obligations for periodic service charges on deposit accounts are typically short-term in nature and are generally satisfied on a monthly basis, while performance obligations for other transaction based fees are typically satisfied at a point in time (which may consist of only a few moments to perform the service or transaction) with no further obligations on behalf of the Company to the customer. Periodic service charges are generally collected monthly directly from the customer’s deposit account, and at the end of a statement cycle, while transaction based service charges are typically collected at the time of or soon after the service is performed. Debit Card Interchange Income. Debit card interchange fee income consists of transaction processing fees associated with customer debit card transactions processed through a payment network and are accounted for under ASC 606. These fees are earned each time a request for payment is originated by a customer debit cardholder at a merchant. In these transactions, the Company transfers funds from the debit cardholder’s account to a merchant through a payment network at the request of the debit cardholder by way of the debit card transaction. The related performance obligations are generally satisfied when the transfer of funds is complete, which is generally a point in time when the debit card transaction is processed. Debit card interchange fees are typically received and recorded as revenue on a daily basis. Earnings on Bank Owned Life Insurance. Earnings on BOLI relate to the periodic increase in the cash surrender value of BOLI policies on certain key employees of the Company for which the Company is the owner and beneficiary of the related policies. This revenue stream is excluded from the scope of ASC 606, and is accounted for under other applicable U.S. GAAP provisions (ASC 325-30). Gains and (Losses) from Sales of Loans and Investment Securities. ASC 606 stipulates that gains and (losses) from the periodic sale of loans and investment securities are excluded from ASC 606 and are accounted for under other applicable U.S. GAAP provisions. Other Income. Other income generally consists of recoveries on acquired loans, which were fully charged off and had no book value prior to their acquisition, as well as other miscellaneous loan fees, and rental income from various subleases. These revenue streams are excluded from the scope of ASC 606 and are accounted for under other applicable U.S. GAAP provisions. Other income also consists of other miscellaneous fees, which are accounted for under ASC 606; however, much like service charges on deposit accounts, these fees have performance obligations that are very short-term in nature and are typically satisfied at a point in time. Revenue is typically recorded at the time these fees are collected, which is generally upon the completion the related transaction or service provided. Other revenue streams that may be applicable to the Company include gains and losses from the sale of non-financial assets such as other real estate owned and property premises and equipment. The Company accounts for these revenue streams in accordance with ASC 610-20, which requires the Company to look to guidance in ASC 606 in the application of certain measurement and recognition concepts. The Company records gains and losses on the sale of non-financial assets when control of the asset has been surrendered to the buyer, which generally occurs at a specific point in time. Practical Expedient. The Company also employs a practical expedient with respect to contract acquisition costs, which are generally capitalized and amortized into expense. These costs relate to expenses incurred directly attributable to the efforts to obtain a contract. The practical expedient allows the Company to immediately recognize contract acquisition costs in current period earnings when these costs would have been amortized over a period of one year or less. At December 31, 2018 the Company did not have any material contract assets or liabilities in its consolidated financial statements related to revenue streams within the scope of ASC 606, and there were no material changes in those balances during the reporting period.

Related Parties

Related Parties	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Parties	Related Parties Loans to the Company’s executive officers and directors are made in the ordinary course of business, in accordance with applicable regulations and the Company’s policies and procedures. At December 31, 2018 , the Company had related party loans outstanding totaling $5.8 million and at December 31, 2017 , the Company had related party loans outstanding totaling $6.1 million . At the end of 2018 , the Company had related party deposits of $471.9 million compared to $378.2 million at the end of 2017 . John J. Carona was appointed to the Board of Directors on March 15, 2013, in connection with the Company’s acquisition of First Associations Bank (“FAB”). Mr. Carona is the President and Chief Executive Officer of Associa, a Texas corporation that specializes in providing management and related services for homeowners associations located across the United States. At December 31, 2018 and 2017 , $436.2 million and $367.9 million , respectively, of the related party deposits were attributable to Associa.

Quarterly Results of Operations

Quarterly Results of Operations (Unaudited)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations (Unaudited)	Quarterly Results of Operations (Unaudited) The following is a summary of selected financial data presented below by quarter for the periods indicated: First Quarter Second Quarter Third Quarter Fourth Quarter (dollars in thousands, except per share data) For the year ended December 31, 2018: Interest income $ 90,827 $ 92,699 $ 128,876 $ 136,021 Interest expense 9,546 11,528 16,163 18,475 Provision for credit losses 2,253 1,761 1,981 2,258 Noninterest income 7,666 8,151 8,240 6,970 Noninterest expense 49,808 50,076 82,782 67,239 Income tax provision 8,884 10,182 7,798 15,376 Net income $ 28,002 $ 27,303 $ 28,392 $ 39,643 Earnings per share: Basic $ 0.61 $ 0.59 $ 0.46 $ 0.64 Diluted 0.60 0.58 0.46 0.63 For the year ended December 31, 2017: Interest income $ 45,427 $ 68,733 $ 70,161 $ 85,684 Interest expense 3,724 5,395 5,870 7,514 Provision for credit losses 2,244 1,945 2,049 2,194 Noninterest income 4,683 8,759 8,221 9,451 Noninterest expense 30,005 48,455 39,612 49,886 Income tax provision 4,616 7,521 10,619 19,370 Net income $ 9,521 $ 14,176 $ 20,232 $ 16,171 Earnings per share: Basic $ 0.35 $ 0.36 $ 0.46 $ 0.37 Diluted 0.34 0.35 0.46 0.36

Parent Company Financial Inform

Parent Company Financial Information	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Parent Company Financial Information	Parent Company Financial Information The Corporation is a California-based bank holding company organized in 1997 as a Delaware corporation and owns 100% of the capital stock of the Bank, its principal operating subsidiary. The Bank was incorporated and commenced operations in 1983. Condensed financial statements of the Corporation are as follows: PACIFIC PREMIER BANCORP, INC. STATEMENTS OF FINANCIAL CONDITION (Parent company only) At December 31, 2018 2017 (dollars in thousands) Assets Cash and cash equivalents $ 13,160 $ 17,097 Investment in subsidiaries 2,068,077 1,329,961 Other assets 1,689 2,599 Total Assets $ 2,082,926 $ 1,349,657 Liabilities Subordinated debentures $ 110,313 $ 105,123 Accrued expenses and other liabilities 2,916 2,538 Total Liabilities 113,229 107,661 Total Stockholders’ Equity 1,969,697 1,241,996 Total Liabilities and Stockholders’ Equity $ 2,082,926 $ 1,349,657 PACIFIC PREMIER BANCORP, INC. STATEMENTS OF OPERATIONS (Parent company only) For the Years Ended December 31, 2018 2017 2016 (dollars in thousands) Income Interest income $ 57 $ 36 $ 31 Noninterest income — — — Total income 57 36 31 Expense Interest expense 6,715 4,720 3,844 Noninterest expense 6,139 8,956 3,769 Total expense 12,854 13,676 7,613 Loss before income tax provision (12,797 ) (13,640 ) (7,582 ) Income tax benefit (3,678 ) (5,417 ) (2,785 ) Net loss (parent only) (9,119 ) (8,223 ) (4,797 ) Equity in net earnings of subsidiaries 132,459 68,323 44,900 Net income $ 123,340 $ 60,100 $ 40,103 PACIFIC PREMIER BANCORP, INC. SUMMARY STATEMENTS OF CASH FLOWS (Parent company only) For the Years Ended December 31, 2018 2017 2016 CASH FLOWS FROM OPERATING ACTIVITIES (dollars in thousands) Net income $ 123,340 $ 60,100 $ 40,103 Adjustments to reconcile net income to cash used in operating activities: Share-based compensation expense 9,033 5,809 2,729 Equity in undistributed earnings of subsidiaries and dividends from the bank (132,459 ) (68,323 ) (44,901 ) Increase (decrease) in accrued expenses and other liabilities 6,464 (365 ) 240 (Decrease) increase in current and deferred taxes (3,682 ) (896 ) — Decrease (increase) in other assets (6,888 ) 1,714 4,794 Net cash (used in) provided by operating activities (4,192 ) (1,961 ) 2,965 CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from issuance of common stock, net of issuance cost — — — Repurchase of common stock (1,669 ) (1,258 ) (125 ) Proceeds from exercise of options and warrants 1,924 4,592 1,107 Capital contribution to Bank — 600 7,765 Proceeds from issuance of subordinated debentures — — — Net cash provided by (used in) financing activities 255 3,934 8,747 Net increase (decrease) in cash and cash equivalents (3,937 ) 1,973 11,712 Cash and cash equivalents, beginning of year 17,097 15,124 3,412 Cash and cash equivalents, end of year $ 13,160 $ 17,097 $ 15,124

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Acquisitions	Acquisitions Grandpoint Capital, Inc. Acquisition Effective as of July 1, 2018, the Company completed the acquisition of Grandpoint Capital, Inc. (“Grandpoint”), the holding company of Grandpoint Bank, a California-chartered bank, with $3.05 billion in total assets, $2.40 billion in gross loans and $2.51 billion in total deposits as of June 30, 2018. Pursuant to the terms of the merger agreement, each outstanding share of Grandpoint voting common stock and Grandpoint non-voting common stock was converted into the right to receive 0.4750 shares of the Corporation’s common stock. The value of the total transaction consideration was approximately $601.2 million after approximately $28.1 million in aggregate cash consideration payable to holders of Grandpoint share-based compensation awards by Grandpoint. The transaction consideration represented the issuance of 15,758,089 shares of the Corporation’s common stock, valued at $38.15 per share, which was the closing price of the Corporation’s common stock on June 29, 2018, the last trading day prior to the consummation of the acquisition. Goodwill in the amount of $313.0 million was recognized in the Grandpoint acquisition. Goodwill represents the future economic benefits rising from net assets acquired that are not individually identified and separately recognized and is attributable to synergies expected to be derived from the combination of the two entities. Goodwill recognized in this transaction is not deductible for income tax purposes. The following table represents the Grandpoint assets acquired and liabilities assumed as of July 1, 2018 and the fair value adjustments and amounts recorded by the Company under the acquisition method of accounting: Grandpoint Fair Value Fair Book Value Adjustment Value (dollars in thousands) ASSETS ACQUIRED Cash and cash equivalents $ 147,551 $ — $ 147,551 Investment securities 395,905 (3,047 ) 392,858 Loans, gross 2,404,042 (51,325 ) 2,352,717 Allowance for loan losses (18,665 ) 18,665 — Fixed assets 6,015 3,107 9,122 Core deposit intangible 5,093 66,850 71,943 Deferred tax assets 14,185 (9,802 ) 4,383 Other assets 97,441 (195 ) 97,246 Total assets acquired $ 3,051,567 $ 24,253 $ 3,075,820 LIABILITIES ASSUMED Deposits $ 2,506,663 $ 266 $ 2,506,929 Borrowings 255,155 (232 ) 254,923 Other Liabilities 23,687 1,172 24,859 Total liabilities assumed 2,785,505 1,206 2,786,711 Excess of assets acquired over liabilities assumed $ 266,062 $ 23,047 289,109 Consideration paid 602,152 Goodwill recognized $ 313,043 Such fair values are preliminary estimates and subject to refinement for up to one year after the closing date of acquisition as additional information relative to the closing date fair values becomes available and such information is considered final, whichever is earlier. Fair value adjustments will be finalized no later than July 2019. Plaza Bancorp Acquisition Effective as of November 1, 2017, the Company completed the acquisition of PLZZ, the holding company of Plaza Bank, a California chartered banking corporation headquartered in Irvine, California with $1.25 billion in total assets, $1.06 billion in gross loans and $1.08 billion in total deposits at October 31, 2017. Pursuant to the terms of the merger agreement, each outstanding share of PLZZ common stock was converted into the right to receive 0.2000 shares of Company common stock. The value of the total deal consideration was approximately $245.8 million after approximately $6.5 million of aggregate cash consideration payable to holders of unexercised options and warrants exercisable for shares of PLZZ common stock by PLZZ. The transaction consideration represented the issuance of 6,049,373 shares of the Company’s common stock, which had a value of $40.40 per share, which was the closing price of the Company’s common stock on October 31, 2017, the last trading day prior to the consummation of the acquisition. Goodwill in the amount of $124.0 million was recognized in the PLZZ acquisition. Goodwill represents the future economic benefits arising from net assets acquired that are not individually identified and separately recognized and is attributable to synergies expected to be derived from the combination of the two entities. Goodwill recognized in this transaction is not deductible for income tax purposes. The following table represents the PLZZ assets acquired and liabilities assumed as of November 1, 2017 and the fair value adjustments and amounts recorded by the Company under the acquisition method of accounting: PLZZ Fair Value Fair Book Value Adjustment Value (dollars in thousands) ASSETS ACQUIRED Cash and cash equivalents $ 150,459 $ — $ 150,459 Loans, gross 1,069,359 (6,458 ) 1,062,901 Allowance for loan losses (13,009 ) 13,009 — Fixed assets 7,389 (1,424 ) 5,965 Core deposit intangible 198 10,575 10,773 Deferred tax assets 11,849 (6,123 ) 5,726 Other assets 19,495 (589 ) 18,906 Total assets acquired $ 1,245,740 $ 8,990 $ 1,254,730 LIABILITIES ASSUMED Deposits $ 1,081,727 $ 1,224 $ 1,082,951 Borrowings 40,755 397 41,152 Other Liabilities 8,956 (450 ) 8,506 Total liabilities assumed 1,131,438 1,171 1,132,609 Excess of assets acquired over liabilities assumed $ 114,302 $ 7,819 122,121 Consideration paid 245,761 Goodwill recognized $ 123,640 The fair values are estimates and are subject to adjustment for up to one year after the merger date. Since the acquisition, the Company has made net adjustments of $1.8 million related to core deposit intangibles, deferred tax assets, loans and other assets and liabilities. During the fourth quarter of 2018, the Company finalized its fair values with this acquisition. Heritage Oaks Bancorp Acquisition Effective as of April 1, 2017, the Company completed the acquisition of HEOP, the holding company of Heritage Oaks Bank, a California state-chartered bank based in Paso Robles, California (“Heritage Oaks Bank”) with $2.01 billion in total assets, $1.36 billion in gross loans and $1.67 billion in total deposits at March 31, 2017. Pursuant to the terms of the merger agreement, each outstanding share of HEOP common stock was converted into the right to receive 0.3471 shares of corporate common stock. The value of the total deal consideration was approximately $467.4 million , which included approximately $3.9 million of aggregate cash consideration payable to holders of Heritage Oaks share-based compensation awards, and the issuance of 11,959,022 shares of the Corporation’s common stock, which had a value of $38.55 per share, which was the closing price of the Corporation’s common stock on March 31, 2017, the last trading day prior to the consummation of the acquisition. Goodwill in the amount of $270.0 million was recognized in the HEOP acquisition. Goodwill represents the future economic benefits arising from net assets acquired that are not individually identified and separately recognized and is attributable to synergies expected to be derived from the combination of the two entities. Goodwill recognized in this transaction is not deductible for income tax purposes. The following table represents the HEOP assets acquired and liabilities assumed as of April 1, 2017 and the fair value adjustments and amounts recorded by the Company under the acquisition method of accounting: HEOP Book Value Fair Value Adjustments Fair Value ASSETS ACQUIRED (dollars in thousands) Cash and cash equivalents $ 78,728 $ — $ 78,728 Investment securities 445,299 (2,376 ) 442,923 Loans, gross 1,384,949 (20,261 ) 1,364,688 Allowance for loan losses (17,200 ) 17,200 — Fixed assets 35,567 (665 ) 34,902 Core deposit intangible 3,207 24,916 28,123 Deferred tax assets 17,850 (7,606 ) 10,244 Other assets 55,235 (21 ) 55,214 Total assets acquired $ 2,003,635 $ 11,187 $ 2,014,822 LIABILITIES ASSUMED Deposits $ 1,668,085 $ 1,465 $ 1,669,550 Borrowings 139,150 (116 ) 139,034 Other Liabilities 8,059 293 8,352 Total liabilities assumed 1,815,294 1,642 1,816,936 Excess of assets acquired over liabilities assumed $ 188,341 $ 9,545 197,886 Consideration paid 467,439 Goodwill recognized $ 269,553 The fair values are estimates and are subject to adjustment for up to one year after the merger date. Since the acquisition, the Company made a net adjustment of $600,000 to deferred tax assets and other liabilities. During the second quarter of 2018, the Company finalized its fair values with this acquisition. Security Bank Acquisition On January 31, 2016, the Company completed its acquisition of Security California Bancorp (“SCAF”) whereby we acquired $714.0 million in total assets, $456.2 million in loans and $636.6 million in total deposits. Under the terms of the merger agreement, each share of SCAF common stock was converted into the right to receive 0.9629 shares of the Corporation’s common stock. The value of the total deal consideration was $120.2 million , which includes $788,000 of aggregate cash consideration to the holders of SCAF stock options and the issuance of 5,815,051 shares of the Corporation’s common stock, valued at $119.4 million based on a closing stock price of $20.53 per share on January 29, 2016. Goodwill in the amount of $51.7 million was recognized in the SCAF acquisition. Goodwill represents the future economic benefits arising from net assets acquired that are not individually identified and separately recognized and is attributable to synergies expected to be derived from the combination of the two entities. Goodwill recognized in this transaction is not deductible for income tax purposes. The following table represents the SCAF assets acquired and liabilities assumed as of January 31, 2016 and the fair value adjustments and amounts recorded by the Company under the acquisition method of accounting: SCAF Book Value Fair Value Adjustments Fair Value (dollars in thousands) ASSETS ACQUIRED Cash and cash equivalents $ 40,947 $ — $ 40,947 Interest-bearing deposits with financial institutions 1,972 — 1,972 Investment securities 191,881 (1,627 ) 190,254 Loans, gross 467,197 (11,039 ) 456,158 Allowance for loan losses (7,399 ) 7,399 — Fixed assets 5,335 (1,145 ) 4,190 Core deposit intangible 493 3,826 4,319 Deferred tax assets 5,618 1,130 6,748 Other assets 10,589 (1,227 ) 9,362 Total assets acquired $ 716,633 $ (2,683 ) $ 713,950 LIABILITIES ASSUMED Deposits $ 636,450 $ 141 $ 636,591 Borrowings — — — Deferred tax liability — — — Other Liabilities 9,063 (220 ) 8,843 Total liabilities assumed 645,513 (79 ) 645,434 Excess of assets acquired over liabilities assumed $ 71,120 $ (2,604 ) 68,516 Consideration paid 120,174 Goodwill recognized $ 51,658 The Company accounted for these transactions under the acquisition method of accounting in accordance with ASC 805, Business Combinations , which requires purchased assets and liabilities assumed to be recorded at their respective fair values at the date of acquisition. The loan portfolios of Grandpoint, PLZZ, HEOP and SCAF were recorded at fair value at the date of each acquisition. The valuation of loan portfolios of Grandpoint, PLZZ, HEOP and SCAF’s were performed as of the acquisition dates to assess their fair values. The loan portfolios were split into two groups: loan with credit deterioration and loans without credit deterioration, and then segmented further by loan type. The fair value was calculated on an individual loan basis using a discounted cash flow analysis. The discount rate utilized was based on a weighted average cost of capital, considering the cost of equity and cost of debt. Also factored into the fair value estimates were loss rates, recovery period and prepayment rates based on industry standards. For loans acquired from Grandpoint, PLZZ, HEOP and SCAF, the contractual amounts due, expected cash flows to be collected, interest component and fair value as of the respective acquisition dates were as follows: Acquired Loans Grandpoint PLZZ HEOP SCAF (dollars in thousands) Contractual amounts due $ 3,496,905 $ 1,708,685 $ 1,717,230 $ 539,806 Cash flows not expected to be collected 39,071 20,152 4,442 2,765 Expected cash flows 3,457,834 1,688,533 1,712,788 537,041 Interest component of expected cash flows 1,105,117 625,632 348,100 80,883 Fair value of acquired loans $ 2,352,717 $ 1,062,901 $ 1,364,688 $ 456,158 In accordance with generally accepted accounting principles, there was no carryover of the allowance for loan losses that had been previously recorded by Grandpoint, PLZZ, HEOP and SCAF. The Company also determined the fair value of the core deposit intangible, securities and deposits with the assistance of third-party valuations and determined the fair value of OREO from recent appraisals of the properties less estimated costs to sell. Since the fair value of intangible assets is calculated as if they were stand-alone assets, the presumption is that a hypothetical buyer of the intangible asset would be able to take advantage of potential after tax benefits resulting from the asset purchase. The core deposit intangible on non-maturing deposit represents future benefits arising from savings on source of funding and was determined by evaluating the underlying characteristics of the deposit relationships, including customer attrition, deposit interest rates, service charge income, overhead expense and costs of alternative funding. The value of the after tax savings on cost of fund is the present value over a estimated fifty-year horizon, using the discount rate applicable to the asset. In determining the fair value of certificates of deposit, a discounted cash flow analysis was used, which involved present valuing the contractual payments over the remaining life of the certificates of deposit at market-based interest rates The operating results of the Company for the twelve months ending December 31, 2018 include the operating results of Grandpoint, PLZZ, HEOP and SCAF since their respective acquisition dates. The following table presents the net interest and other income, net income and earnings per share as if the merger with Grandpoint, PLZZ, HEOP and SCAF were effective as of January 1, 2016. The unaudited pro forma information in the following table is intended for informational purposes only and is not necessarily indicative of our future operating results or operating results that would have occurred had the mergers been completed at the beginning of each respective year. N o assumptions have been applied to the pro forma results of operations regarding possible revenue enhancements, expense efficiencies or asset dispositions. There were no material, nonrecurring adjustments to the unaudited pro forma net interest and other income, net income and earnings per share presented below: Year Ended December 31, 2018 2017 2016 Net interest and other income $ 473,748 $ 465,400 $ 378,894 Net income 133,565 96,758 104,908 Basic earnings per share 2.16 1.58 1.71 Diluted earnings per share 2.14 1.56 1.70

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Quarterly Cash Dividend On January 28, 2019, the Company’s Board of Directors declared a cash dividend of $0.22 per share, payable on March 1, 2019 to shareholders of record on February 15, 2019.

Description of Business and S_2

Description of Business and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Description of Business	Description of Business —Pacific Premier Bancorp, Inc., a Delaware corporation organized in 1997 (the “Corporation”), is a California-based bank holding company that owns 100% of the capital stock of Pacific Premier Bank, a California-chartered commercial bank (the “Bank,” and together with the Corporation and its consolidated subsidiaries, the “Company”), the Corporation’s principal operating subsidiary. The Bank was incorporated and commenced operations in 1983. The principal business of the Company is attracting deposits from the general public and investing those deposits, together with funds generated from operations and borrowings, primarily in business loans and real estate property loans. At December 31, 2018 , the Company had 44 depository branches located in the counties of Orange, Los Angeles, Riverside, San Bernardino, San Diego, San Luis Obispo and Santa Barbara, California, as well as Pima and Maricopa Counties, Arizona, Clark County, Nevada and Clark County, Washington. The Company is subject to competition from other financial institutions. The Company is subject to the regulations of certain governmental agencies and undergoes periodic examinations by those regulatory authorities.
Principles of Consolidation	Principles of Consolidation —The consolidated financial statements include the accounts of Corporation and its wholly-owned subsidiary the Bank. The Company accounts for its investments in its wholly-owned special purpose entities, PPBI Statutory Trust I, Heritage Oaks Capital Trust II, Mission Community Capital Trust I Santa Lucia Bancorp (CA) Capital Trust and First Commerce Bancorp Statutory Trust I, under the equity method whereby the subsidiary’s net earnings are recognized in the Company’s Statement of Income and the investment in these entities is included in Other Assets on the Company’s Consolidated Statements of Financial Condition. The Company is organized and operates as a single reporting segment, principally engaged in the commercial banking business. All significant intercompany accounts and transactions have been eliminated in consolidation.
Basis of Financial Statement Presentation	Basis of Financial Statement Presentation —The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States (‘‘U.S. GAAP’’). Certain amounts in the financial statements and related footnote disclosures for the prior years have been reclassified to conform to the current presentation with no impact to previously reported net income or stockholders’ equity.
Use of Estimates	Use of Estimates —The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Estimates may change as new information is obtained.
Cash and Cash Equivalents	Cash and Cash Equivalents —Cash and cash equivalents include cash on hand, cash balances due from banks and federal funds sold. Interest bearing deposits with financial institutions represent primarily cash held at the Federal Reserve Bank of San Francisco. At December 31, 2018 , there were no cash reserves required by the Board of Governors of the Federal Reserve System (“Federal Reserve”) for depository institutions based on the amount of deposits held. The Company maintains amounts due from banks that exceed federally insured limits. The Company has not experienced any losses in such accounts.
Securities	Securities —The Company has established written guidelines and objectives for its investing activities. At the time of purchase, management designates the security as either held to maturity, available-for-sale or held for trading based on the Company’s investment objectives, operational needs and intent. The investments are monitored to ensure that those activities are consistent with the established guidelines and objectives.
Securities Held-to-Maturity/Available-for-sale	Securities Available-for-Sale —Investments in debt securities that management has no immediate plan to sell, but which may be sold in the future, are carried at fair value. Premiums and discounts are amortized using the interest method over the remaining period to the call date for premiums or contractual maturity for discounts and, in the case of mortgage-backed securities, the estimated average life, which can fluctuate based on the anticipated prepayments on the underlying collateral of the securities. Unrealized holding gains and losses, net of tax, are recorded in a separate component of stockholders’ equity as accumulated other comprehensive income. Realized gains and losses on the sales of securities are determined on the specific identification method, recorded on a trade date basis based on the amortized cost basis of the specific security and are included in noninterest income as net gain (loss) on investment securities. Securities Held-to-Maturity —Investments in debt securities that management has the positive intent and ability to hold to maturity are reported at cost and adjusted for periodic principal payments and the amortization of premiums and accretion of discounts, which are recognized in interest income using the interest method over the period of time to investment’s maturity.
Impairment of Investments	Impairment of Investments —Quarterly, the Company evaluates investment securities in an unrealized loss position for OTTI. In determining whether a security’s decline in fair value is other-than-temporary, the Company considers a number of factors including: (i) the length of time and the extent to which the fair value of the investment has been less than its amortized cost; (ii) the financial condition and near-term prospects of the issuer; (iii) the intent and ability of the Company to hold the investment for a period of time sufficient to allow for an anticipated recovery in fair value; (iv) downgrades in credit ratings; and (v) general market conditions which reflect prospects for the economy as a whole, including interest rates and sector credit spreads. If it is determined that an OTTI exists, and either the Company intends to sell the investment or it is likely the Company will be required to sell the investment before its anticipated recovery, the total amount of the OTTI, which is measured as the amount by which the investment’s amortized cost exceeds its fair value, is recognized in current period earnings. If the Company has the intent and ability to hold the investment and it is more likely than not it will be required to sell the investment prior to an anticipated recovery of its amortized cost basis, the Company records in current period earnings the portion of OTTI deemed to be credit related, while the remaining portion of OTTI deemed to be non-credit related is recorded in accumulated other comprehensive income. Credit related losses are determined through a discounted cash flow analysis, which incorporates assumptions concerning the estimated timing and amounts of expected cash flows. Non-credit related OTTI losses result from other factors such as change in interest rates and general market conditions. The presentation of OTTI in the consolidated financial statements is on a gross basis with a reduction in the gross amount for the portion of the loss deemed non-credit related and is recorded in accumulated other comprehensive income.
Federal Home Loan Bank Stock	Federal Home Loan Bank Stock —The Bank is a member of the Federal Home Loan Bank System. Members are required to own a certain amount of stock based on the level of borrowings and other factors, and may invest in additional amounts. FHLB stock is carried at cost and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are recorded as a component of interest income.
Federal Reserve Bank Stock	Federal Reserve Bank Stock —The Bank is a member of the Federal Reserve Bank of San Francisco (the “FRB”). FRB stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are recorded as a component of interest income.
Loans Held for Sale	Loans Held for Sale —Loans that the Company has the intent to sell prior to maturity have been designated as held for sale at origination and are recorded at lower of cost or fair value. Gains or losses are recognized upon the sale of the loans on a specific identification basis.
Loan Servicing Assets	Loan Servicing Assets —Servicing assets are related to SBA loans sold and are recognized at the time of sale when servicing is retained with the income statement effect recorded in gains on sales of SBA loans. Servicing assets are initially recorded at fair value based on the present value of the contractually specified servicing fee, net of estimated servicing costs, over the estimated life of the loan, using a discount rate. The Company’s servicing costs approximates the industry average servicing costs of approximately 40 basis points. The servicing assets are subsequently amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans. The Company periodically evaluates servicing assets for impairment based upon the fair value of the assets as compared to their carrying amount. The Company typically sells the guaranteed portion of SBA loans and retains the unguaranteed portion (“retained interest”). A portion of the premium on sale of SBA loans is recognized as gain on sale of loans at the time of the sale by allocating the carrying amount between the asset sold and the retained interest, based on their relative fair values. The remaining portion of the premium is recorded as a discount on the retained interest and is amortized over the remaining life of the loan as an adjustment to yield. The retained interest, net of any discount, are included in loans held for investment—net of allowance for loan losses in the accompanying consolidated statements of financial condition.
Loans Held for Investment	Loans Held for Investment —Loans held for investment are loans the Company has the ability and intent to hold until their maturity. The loans are carried at amortized cost, net of discounts and premiums on purchased loans, deferred loan origination fees and costs and ALLL. Net deferred loan origination fees and costs on loans are amortized or accreted using the interest method over the expected life of the loans. Amortization of deferred loan fees and costs are discontinued for loans placed on nonaccrual. Any remaining deferred fees or costs and prepayment fees associated with loans that payoff prior to contractual maturity are included in loan interest income in the period of payoff. Loan commitment fees received to originate or purchase a loan are deferred and, if the commitment is exercised, recognized over the life of the loan using the interest method as an adjustment of yield or, if the commitment expires unexercised, recognized as income upon expiration of the commitment. Interest on loans is recognized using the interest method and is only accrued if deemed collectible. Loans for which the accrual of interest has been discontinued are designated as nonaccrual loans. The accrual of interest on loans is discontinued when principal or interest is past due 90 days based on contractual terms of the loan or when, in the opinion of management, there is reasonable doubt as to collection of principal and or interest. When loans are placed on nonaccrual status, all interest previously accrued but not collected is reversed against current period interest income. Interest income generally is not recognized on nonaccrual loans unless the likelihood of further loss is remote. Interest payments received on nonaccrual loans are applied as a reduction to the loan principal balance. Interest accruals are resumed on such loans only when they are brought current with respect to interest and principal and when, in the judgment of management, the loans are estimated to be fully collectible as to all principal and interest. A loan is considered to be impaired when it is probable that the Company will be unable to collect all amounts due (principal and interest) according to the contractual terms of the loan agreement. The Company reviews loans for impairment when the loan is classified as substandard or worse, delinquent 90 days, determined by management to be collateral dependent, or when the borrower files bankruptcy or is granted concession which qualifies as a troubled debt restructuring. Measurement of impairment is based on the loan’s expected future cash flows discounted at the loan’s effective interest rate, measured by reference to an observable market value, if one exists, or the fair value of the collateral if the loan is deemed collateral dependent. The Company selects the measurement method on a loan-by-loan basis except those loans deemed collateral dependent. Loans for which impairment has been determined are generally charged-off at such time the loan is classified as a loss.
Allowance for Loan Losses	Allowance for Loan Losses— The Company maintains an ALLL at a level deemed appropriate by management to provide for known or probable incurred losses in the portfolio as of the date of the consolidated statements of financial condition. The Company has an internal loan review system and loss allowance methodology designed to provide for the detection of problem loans and an appropriate level of allowance to cover loan losses. Management’s determination of the adequacy of the ALLL is based on an evaluation of the composition of the portfolio, actual loss experience, industry charge-off experience on income property loans, current economic conditions, and other relevant factors in the area in which the Company’s lending and real estate activities are based. These factors may affect the borrower’s ability to pay as well as the value of the underlying collateral securing loans. The allowance is calculated by applying loss factors to loans held for investment according to loan type and loan credit classification. The loss factors are based primarily upon the Bank’s historical loss experience and industry charge-off experience, and are evaluated on a quarterly basis. At December 31, 2018 , the following portfolio segments have been identified. Segments are groupings of similar loans at a level, for which the Company has adopted systematic methods of documentation for determining its allowance for loan losses: • Commercial and industrial (including Franchise) - Commercial and industrial (“C&I”) loans are secured by business assets including inventory, receivables and machinery and equipment to businesses located generally in our primary market area. Loan types includes revolving lines or credit, term loans, seasonal loans and loans secured by liquid collateral such as cash deposits or marketable securities. Homeowners’ Association (“HOA”) credit facilities are included in C&I loans. We also issue letters of credit on behalf of our customers. Risk arises primarily due to the difference between expected and actual cash flows of the borrowers. In addition, the recoverability of the Company’s investment in these loans is also dependent on other factors primarily dictated by the type of collateral securing these loans. The fair value of the collateral securing these loans may fluctuate as market conditions change. In the case of loans secured by accounts receivable, the recovery of the Company’s investment is dependent upon the borrower’s ability to collect amounts due from its customers. • Commercial real estate (including owner-occupied and nonowner occupied) - Commercial real estate (“CRE”) includes various type of loans which the Company holds real property as collateral. CRE lending activity is typically restricted to owner-occupied or nonowner-occupied. The primary risks of real estate loans include the borrower’s inability to pay, material decreases in the value of the real estate that is being held as collateral and significant increases in interest rates, which may make the real estate loan unprofitable to the borrower. Real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy. • SBA - We are approved to originate loans under the SBA’s Preferred Lenders Program (“PLP”). The PLP lending status affords us a higher level of delegated credit autonomy, translating to a significantly shorter turnaround time from application to funding, which is critical to our marketing efforts. We originate loans nationwide under the SBA’s 7(a), SBA Express, International Trade and 504(a) loan programs, in conformity with SBA underwriting and documentation standards. SBA loans are similar to commercial business loans, but have additional credit enhancement provided by the U.S. Small Business Administration, for up to 85.00% of the loan amount for loans up to $150,000 and 75.00% of the loan amount for loans of more than $150,000. The Company originates SBA loans with the intent to sell the guaranteed portion into the secondary market on a quarterly basis. • Agribusiness and farmland - We originate loans to the agricultural community to fund seasonal production and longer term investments in land, buildings, equipment, crops and livestock. Agribusiness loans are for the purpose of financing agricultural production to finance crops and livestock. Farmland loans include all land known to be used or usable for agricultural purposes, such as crop and livestock production and is secured by the land and improvements thereon. • Multi-family - Loans secured by multi-family and commercial real estate properties generally involve a greater degree of credit risk than one-to-four family loans. Because payments on loans secured by multi-family and commercial real estate properties are often dependent on the successful operation or management of the properties, repayment of these loans may be subject to adverse conditions in the real estate market or the economy. • One-to-four family - Although we do not originate, through our bank acquisitions, we have acquired first lien single family loans, we occasionally purchase such loans to diversify our portfolio. The primary risks of one-to-four family loans include the borrower’s inability to pay, material decreases in the value of the real estate that is being held as collateral and significant increases in interest rates, which may make loans unprofitable. • Construction and land - We originate loans for the construction of one-to-four family and multi-family residences and CRE properties in our market area. We concentrate our efforts on single homes and small infill projects in established neighborhoods where there is not abundant land available for development. Construction loans are considered to have higher risks due to construction completion and timing risk, and the ultimate repayment being sensitive to interest rate changes, government regulation of real property and the availability of long-term financing. Additionally, economic conditions may impact the Company’s ability to recover its investment in construction loans, as adverse economic conditions may negatively impact the real estate market, which could affect the borrower’s ability to complete and sell the project. Additionally, the fair value of the underlying collateral may fluctuate as market conditions change. We occasionally originate land loans located predominantly in California for the purpose of facilitating the ultimate construction of a home or commercial building. The primary risks include the borrower’s inability to pay and the inability of the Company to recover its investment due to a decline in the fair value of the underlying collateral. • Consumer loans - In addition to consumer loans acquired through our various bank acquisitions, we originate a limited number of consumer loans, generally for banking customers only, which consist primarily of home equity lines of credit, savings account secured loans and auto loans. Repayment of these loans is dependent on the borrower’s ability to pay and the fair value of the underlying collateral. Various regulatory agencies, as an integral part of their examination process, periodically review the Company’s ALLL and loan review process. Such agencies may require the Company to recognize additions to the allowance based on judgments different from those of management. In the opinion of management, and in accordance with the credit loss allowance methodology, the present allowance is considered adequate to absorb probable incurred credit losses as of the date of these consolidated financial statements. Additions and reductions to the allowance are reflected in current operations. Charge-offs recorded against the allowance, for all loan segments, are made when specific loans are considered uncollectible or are transferred to other real estate owned and the fair value of the property is less than the Company’s recorded investment in the loan. Recoveries of amounts previously charged-off are credited to the allowance. Although management uses the best information available to make these estimates, future adjustments to the allowance may be necessary due to economic, operating, regulatory and other conditions that may extend beyond the Company’s control.
Purchased Credit Impaired Loans	Purchased Credit Impaired Loans. As part of business acquisitions, the Bank acquires certain loans that have shown evidence of credit deterioration since origination, referred to as purchased credit impaired loans. These loans are recorded at the fair value, such that no ALLL for purchase credit impaired (“PCI”) is established upon their acquisition. The Company has elected to account for such loans individually. The Company estimates the amount and timing of expected cash flows for each purchased loan, and the expected cash flows in excess of the fair value is recorded as interest income over the remaining life of the loan and is referred to as the accretable yield. The excess of the loan’s contractual principal and interest over expected cash flows is not recorded and is referred to as the non-accretable difference. Over the life of the loan, expected cash flows continue to be estimated. Subsequent decreases in expected future cash flows beyond the expected cash flows as of the acquisition date are accounted for through a charge to the provision for loan losses. If subsequent reforecasts indicate there has been a probable and significant increase in the level of expected future cash flows, the Company first reduces any previously established ALLL for PCI loans and then accounts for the remainder of the increase through interest income as a yield adjustment.
Other Real Estate Owned	Other Real Estate Owned. Real estate properties acquired through, or in lieu of, loan foreclosure are recorded at fair value, less cost to sell, with any excess loan balance over the fair value of the property charged against the ALLL. The Company obtains an appraisal and/or market valuation on all other real estate owned at the time of possession. After foreclosure, valuations are periodically performed by management. Any subsequent declines in fair value are recorded as a charge to current period earnings with a corresponding write-down to the asset. All legal fees and direct costs, including foreclosure and other related costs are expensed as incurred.
Premises and Equipment	Premises and Equipment. Premises and equipment are carried at cost less accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the assets, which range from forty years for buildings, seven years for furniture, fixtures and equipment, and three years for computer and telecommunication equipment. The cost of leasehold improvements is amortized using the straight-line method over the shorter of the estimated useful life of the asset or the term of the related leases. The Company periodically evaluates the recoverability of long-lived assets, such as premises and equipment, to ensure the carrying value has not been impaired. Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell.
Securities Sold Under Agreements to Repurchase	Securities Sold Under Agreements to Repurchase. The Company enters into sales of securities under agreement to repurchase. These agreements are treated as financing arrangements and, accordingly, the obligations to repurchase the securities sold are reflected as liabilities in the Company’s consolidated financial statements. The securities collateralizing these agreements are delivered to several major national brokerage firms who arranged the transactions. The securities are reflected as assets in the Company’s consolidated financial statements. The brokerage firms may loan such securities to other parties in the normal course of their operations and agree to return the identical security to the Company at the maturity of the agreements.
Bank Owned Life Insurance	Bank Owned Life Insurance. Bank owned life insurance (“BOLI”) is accounted for using the cash surrender value method and is recorded at its realizable value. Changes in the cash surrender value of BOLI are recorded as a component of noninterest income.
Goodwill and Core Deposit Intangible	Goodwill and Core Deposit Intangible. Goodwill is generally determined as the excess of the fair value of the consideration transferred, plus the fair value of any noncontrolling interests in the acquiree, over the fair value of the net assets acquired and liabilities assumed as of the acquisition date. Goodwill and intangible assets acquired in a purchase business combination and determined to have indefinite useful lives are not amortized, but tested for impairment at least annually or more frequently if events and circumstances exist that indicate the necessity for such impairment tests to be performed. The Company typically performs its annual impairment testing in the fourth quarter. Intangible assets with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Goodwill is the only intangible asset with an indefinite life recorded in the Company’s consolidated balance sheets. Core deposit intangible assets arising from whole bank acquisitions are amortized on either an accelerated basis, reflecting the pattern in which the economic benefits of the intangible asset is consumed or otherwise used up, or on a straight-line amortization method over their estimated useful lives, which ranges from 6 to 11.5 years.
Loan Commitments and Related Financial Instruments	Loan Commitments and Related Financial Instruments. Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded.
Subordinated Debentures	Subordinated Debentures. Long-term borrowings are carried at cost, adjusted for amortization of premiums and accretion of discounts, which are recognized in interest expense using the interest method. Debt issuance costs are recognized in interest expense using the interest method over the life of the instrument.
Stock-Based Compensation	Stock-Based Compensation. The Company issues various forms of stock-based compensation awards annually to officers and directors of the Company, including stock options, restricted stock awards and restricted stock units. The related compensation costs are recognized in the income statement based on the grant-date fair value over the period they are expected to vest, net of estimates for forfeitures. Estimates for forfeitures are based on the Company’s historical experience for each award type. A Black-Scholes model is utilized to estimate the fair value of stock options. The Black-Scholes model uses certain assumptions to determine grant-date fair value such as: expected volatility, expected term of the option, expected risk-free rate of interest and expected dividend yield on the Company’s common stock. The market price of the Company’s common stock at the grant-date is used for restricted stock awards in determining the grant-date fair value for those awards. Restricted stock units are granted to officers of the Company. Restricted stock units are stock-based compensation awards that when ultimately settled, result in the payment of cash or the issuance of shares of the Company’s common stock to the holder of the award. As with other stock-based compensation awards, compensation cost for restricted stock units is recognized over the period in which the awards are expected to vest. Certain of the Company’s restricted stock units contain vesting conditions which are based on pre-determined performance targets. The level at which the associated performance targets are achieved can impact the ultimate settlement of the award with the grantee and thus the level of compensation expense ultimately recognized. Certain of these awards contain a market condition whereby the vesting of the award is based on the Company’s performance, such as total shareholder return, relative to its peers over a specified period of time. The grant date fair value of market based restricted stock units is determined through the use of an independent third party which employs the use of a Monte Carlo simulation. The Monte Carlo simulation estimates grant date fair value using input assumptions similar to those used in the Black-Scholes model, however, it also incorporates into the grant date fair value calculation the probability that the performance targets will be achieved. The grant date fair value of restricted stock units that do not contain a market condition for vesting is based on the price of the Company’s common stock on the grant date.
Income Taxes	Income Taxes. Deferred tax assets and liabilities are recorded for the expected future tax consequences of events that have been recognized in the Company’s financial statements or tax returns using the asset liability method. In estimating future tax consequences, all expected future events other than enactments of changes in the tax law or rates are considered. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date. Deferred tax assets are to be recognized for temporary differences that will result in deductible amounts in future years and for tax carryforwards if, in the opinion of management, it is more likely than not that the deferred tax assets will be realized. At December 31, 2018, no valuation allowance was deemed necessary against the Company’s deferred tax assets. At December 31, 2017, a valuation allowance of $380,000 was recorded against the capital loss carryover deferred tax asset, as the Company does not believe it will generate sufficient capital gain before the capital loss carryover expires. A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. The Company recognizes interest and / or penalties related to income tax matters in income tax expense.
Earnings per Share	Earnings per Share. Earnings per share of common stock is calculated on both a basic and diluted basis based on the weighted average number of common and common equivalent shares outstanding, excluding common shares in treasury. Basic earnings per share excludes potential dilution and is computed by dividing income available to stockholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted from the issuance of common stock that then would share in earnings.
Comprehensive Income	Comprehensive Income. Comprehensive income is reported in addition to net income for all periods presented. Comprehensive income is a more inclusive financial reporting methodology that includes disclosure of other comprehensive income (loss) that historically has not been recognized in the calculation of net income. Unrealized gains and losses on the Company’s available-for-sale investment securities are required to be included in other comprehensive income or loss. Total comprehensive income (loss) and the components of accumulated other comprehensive income or loss are presented in the Consolidated Statement of Stockholders’ Equity and Consolidated Statements of Comprehensive Income.
Loss Contingencies	Loss Contingencies. Loss contingencies, including claims and legal action arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Management does not believe there now are such matters that will have a material effect on the financial statements.
Fair Value of Financial Instruments	Fair Value of Financial Instruments. Fair values of financial instruments are estimated using relevant market information and other assumptions, as more fully disclosed in a separate note. Fair value is an exit price, representing the amount that would be received to sell an asset or transfer a liability in an orderly transaction between market participants. Fair value estimates involve uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments, and other factors, especially in the absence of broad markets for particular items. Fair value measures are classified according to a three-tier fair value hierarchy, which is based on the observability of inputs used to measure fair value. U.S. GAAP requires the Company to maximize the use of observable inputs when measuring fair value. Changes in assumptions or in market conditions could significantly affect these estimates. The fair value of an asset or liability is the exchange price that would be received to sell that asset or paid to transfer that liability (exit price) in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach, and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. ASC Topic 825 requires disclosure of the fair value of financial assets and financial liabilities, including both those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis and a non-recurring basis. The methodologies for estimating the fair value of financial assets and financial liabilities that are measured at fair value, and for estimating the fair value of financial assets and financial liabilities not recorded at fair value, are discussed below. In accordance with accounting guidance, the Company groups its financial assets and financial liabilities measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described as follows: Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 2 - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, prepayment speeds, volatilities, etc.) or model-based valuation techniques where all significant assumptions are observable, either directly or indirectly, in the market. Level 3 - Valuation is generated from model-based techniques where one or more significant inputs are not observable, either directly or indirectly, in the market. These unobservable assumptions reflect the Company’s own estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques may include use of matrix pricing, discounted cash flow models, and similar techniques. Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with precision. Changes in assumptions could significantly affect the fair values presented. Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent limitations in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates presented herein are not necessarily indicative of the amounts the Company could have realized in a sales transaction at December 31, 2018 and December 31, 2017 . A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Management maximizes the use of observable inputs and attempts to minimize the use of unobservable inputs when determining fair value measurements. Estimated fair values are disclosed for financial instruments for which it is practicable to estimate fair value. These estimates are made at a specific point in time based on relevant market data and information about the financial instruments. These estimates do not reflect any premium or discount that could result from offering the Company’s entire holdings of a particular financial instrument for sale at one time, nor do they attempt to estimate the value of anticipated future business related to the instruments. In addition, the tax ramifications related to the realization of unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in any of these estimates. The following is a description of both the general and specific valuation methodologies used for certain instruments measured at fair value, as well as the general classification of these instruments pursuant to the valuation hierarchy. Investment securities. Investment securities are generally valued based upon quotes obtained from an independent third-party pricing service, which uses evaluated pricing applications and model processes. Observable market inputs, such as, benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data are considered as part of the evaluation. The inputs are related directly to the security being evaluated, or indirectly to a similarly situated security. Market assumptions and market data are utilized in the valuation models. The Company reviews the market prices provided by the third-party pricing service for reasonableness based on the Company’s understanding of the market place and credit issues related to the securities. The Company has not made any adjustments to the market quotes provided by them and, accordingly, the Company categorized its investment portfolio within Level 2 of the fair value hierarchy. Impaired Loans and Other Real Estate Owned. A loan is considered impaired when it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement. Impairment is measured based on the fair value of the underlying collateral or the discounted expected future cash flows. The Company measures impairment on all non-accrual loans for which it has reduced the principal balance to the value of the underlying collateral less the anticipated selling cost. As such, the Company records impaired loans as Level 3. At December 31, 2018 , substantially all the Company’s impaired loans were evaluated based on the fair value of their underlying collateral based upon the most recent appraisal available to management and has recorded a specific reserve on one loan in the amount of $584,000 with a principal balance of $1.0 million . The fair value of impaired loans and other real estate owned were determined using Level 3 assumptions, and represents impaired loan and other real estate owned balances for which a specific reserve has been established or on which a write down has been taken. Generally, the Company obtains third party appraisals (or property valuations) and/or collateral audits in conjunction with internal analysis based on historical experience on its impaired loans and other real estate owned to determine fair value. In determining the net realizable value of the underlying collateral for impaired loans, the Company will then discount the valuation to cover both market price fluctuations and selling costs the Company expected would be incurred in the event of foreclosure. In addition to the discounts taken, the Company’s calculation of net realizable value considered any other senior liens in place on the underlying collateral.
Reclassifications	Reclassifications. Some items in prior year financial statements were reclassified to conform to the current presentation. Reclassifications had no effect on prior year net income or stockholders’ equity.
Recent Accounting Pronouncements	Accounting Standards Adopted in 2018 In February 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ( “ ASU” or “Update”) 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income . On December 22, 2017, the Tax Cuts and Jobs Act of 2017 was signed into law, which among other things reduced the maximum federal corporate tax rate from 35% to 21%. This Update addresses concerns about the guidance in current U.S. GAAP that requires deferred tax liabilities and assets to be adjusted for the effect of a change in tax laws or rates with the effect included in income from continuing operations in the reporting period that includes the enactment date. That guidance is applicable even in situations in which the related income tax effects of items in accumulated other comprehensive income (“AOCI”) were originally recognized in other comprehensive income (rather than in income from continuing operations). As a result of the adjustment of deferred taxes being required to be included in income from continuing operations, the tax effects of items within accumulated other comprehensive income (referred to as stranded tax effects for purposes of this Update) did not reflect the appropriate tax rate. This Update allows for an election to reclassify between retained earnings and AOCI the impact of the federal income tax rate change. The amendments in this Update are effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption of the amendments of this Update is permitted. The Company elected to early adopt in the first quarter of 2018. Accordingly, the Company recorded an increase to AOCI and a decrease to retained earnings of approximately $82,000 for stranded tax effects on available for sale investment securities in the first quarter of 2018. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business . Under the current implementation guidance in Topic 805, there are three elements of a business-inputs, processes, and outputs. While an integrated set of assets and activities (collectively referred to as a “set”) that is a business usually has outputs, outputs are not required to be present. In addition, all the inputs and processes that a seller uses in operating a set are not required if market participants can acquire the set and continue to produce outputs. The amendments in this Update provide a screen to determine when a set is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This screen reduces the number of transactions that need to be further evaluated. If the screen is not met, the amendments in this Update (1) require that to be considered a business, a set must include, at a minimum, an input and a substantive process that together significantly contribute to the ability to create output and (2) remove the evaluation of whether a market participant could replace missing elements. The amendments provide a framework to assist entities in evaluating whether both an input and a substantive process are present. The framework includes two sets of criteria to consider that depend on whether a set has outputs. Although outputs are not required for a set to be a business, outputs generally are a key element of a business; therefore, the Company has developed more stringent criteria for sets without outputs. Lastly, the amendments in this Update narrow the definition of the term output so that the term is consistent with how outputs are described in Topic 606. Public business entities should apply the amendments in this Update to annual periods beginning after December 15, 2017, including interim periods within those periods. The adoption of this standard did not have a material effect on the Company’s operating results or financial condition. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash . This Update requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The amendments in this Update are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The adoption of this standard did not have a material effect on the Company’s operating results or financial condition. In August 2016, the FASB issued ASU 2016-15, Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments . This Update provides guidance on eight specific cash flow classification issues, which include: 1) debt prepayment or debt extinguishment costs; 2) settlement of zero-coupon debt instruments or debt with coupon interest rates that are insignificant in relation to the effective interest rate; 3) contingent consideration payments made soon after a business combination; 4) proceeds from the settlement of insurance claims; 5) proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; 6) distributions received from equity method investments; 7) beneficial interest in securitization transactions; and 8) separately identifiable cash flows and the application of the predominance principle. The amendments in this Update are effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period; however, an entity is required to adopt all of the amendments in the same period. The amendments in this Update should be applied using a retrospective transition method to each period presented. The adoption of this standard did not have a material effect on the Company’s operating results or financial condition. In January 2016, the FASB issued ASU 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, ASU 2018-04, Investments-Debt Securities (Topic 320) and Regulated Operations (Topic 980): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 117 and SEC Release No.33-9273 (SEC Update), ASU 2018-03, Technical Corrections and Improvements to Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities . Changes made to the current measurement model primarily affect the accounting for equity securities with readily determinable fair values, where changes in fair value are included in earnings instead of other comprehensive income. The accounting for other financial instruments, such as loans, investments in debt securities, and financial liabilities is largely unchanged. This Update also changes the presentation and disclosure requirements for financial instruments including a requirement that public business entities use exit price when measuring the fair value of financial instruments measured at amortized cost for disclosure purposes. This Update is effective for public business entities in fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The adoption of ASU 2016-01 did not have a material effect on the Company’s operating results or financial condition. In accordance with the guidance, the Company measures the fair value of financial instruments reported at amortized cost on the statement of financial condition using the exit price notion. For further details, refer to footnote Fair Value of Financial Instruments within these consolidated financial statements. ASU 2014-09, Revenue From Contracts With Customers (Topic 606), ASU 2015-14 Revenue from Contracts with Customers (Topic 606): Deferral of Effective Date, ASU 2016-08 Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net), ASU 2016-10 Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, ASU 2016-11 Revenue Recognition (Topic 605) and Derivatives ad Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting, ASU 2016-12 Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients and ASU 2016-20 Revenue from Contracts with Customers (Topic 606): Technical Corrections and Improvements to Topic 606 . With this ASU, the FASB amended existing guidance related to revenue from contracts with customers, superseding and replacing nearly all existing revenue recognition guidance, including industry-specific guidance, establishing a new control-based revenue recognition model, changing the basis for deciding when revenue is recognized over time or at a point in time, providing new and more detailed guidance on specific topics and expanding and improving disclosures about revenue. In addition, this guidance specifies the accounting for some costs to obtain or fulfill a contract with a customer. The amendments are effective for public entities for annual reporting periods beginning after December 15, 2017. The Company adopted the provisions of ASU 2014-09 and its related amendments effective January 1, 2018 utilizing the modified retrospective transition method and determined the adoption was insignificant to the financial statements. Since the impact upon adoption of ASU 2014-09 and its related amendments was insignificant to the financial statements, a cumulative effect adjustment to retained earnings was not deemed necessary. The Company’s review of its various revenue streams indicated that approximately 99% of the Company’s revenue is out of the scope of ASU 2014-09 and its related amendments, including all of the Company’s net interest income and a significant portion of non-interest income. For those revenue streams that are within the scope of ASU 2014-09 and its related amendments, the Company reviewed the associated customer contracts and agreements to determine the appropriate accounting for revenues under those contracts. The Company’s review did not identify any significant changes in the timing of revenue recognition under those contracts within the scope of ASU 2014-09 and its related amendments. Significant revenue streams that are within scope primarily relate to service charges and fees associated customer deposit accounts, as well as fees for various other services the Company provides its customers. As a result of the implementation of ASU 2014-09 and its related amendments, the Company conducts a detailed review of its revenue streams at least annually, or more frequently if deemed necessary. Recent Accounting Guidance Not Yet Effective In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement . The amendments in this Update modify the disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement. The following disclosure requirements for public companies were removed from Topic 820: • The amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy. • The policy for timing of transfers between levels. • The valuation process for Level 3 fair value measurements. The following disclosure requirements for public companies were modified in Topic 820: • The amendments clarify that the measurement of uncertainty disclosure is to communicate information about the uncertainty in measurement as of the reporting date. The following disclosure requirements for public companies were added to Topic 820: • The changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period • The range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. For certain unobservable inputs, an entity may disclose other quantitative information (such as the median or arithmetic average) in lieu of the weighted average if the entity determines that other quantitative information would be a more reasonable and rational method to reflect the distribution of unobservable inputs used to develop Level 3 fair value measurements The amendments in this Update are effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. In addition, an entity may early adopt any of the removed or modified disclosures immediately and delay adoption of the new disclosures until the effective date. The Company is currently evaluating the effects of ASU 2018-13 on its financial statements and disclosures. In March 2017, the FASB issued ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchase Callable Debt Securities . This Update amends guidance on the amortization period of premiums on certain purchased callable debt securities. The amendments shorten the amortization period of premiums on purchased callable debt securities to the earliest call date. This Update should be applied on a modified retrospective basis through a cumulative-effect adjustment to beginning retained earnings. The effective date of ASU 2017-08 is for interim and annual reporting periods beginning after December 15, 2018. The adoption of this standard did not have a material effect on the Company’s operating results or financial condition. In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . This Update replaces the incurred loss impairment model in current U.S. GAAP with a model that reflects current expected credit losses (“CECL”). The CECL model is applicable to the measurement of credit losses on financial assets measured at amortized cost, including loan receivables and held-to-maturity debt securities. It also applies to off-balance sheet credit exposures. The Update requires that all expected credit losses for financial assets held at the reporting date be measured based on historical experience, current conditions and reasonable and supportable forecasts. The Update also requires enhanced disclosure, including qualitative and quantitative disclosures that provide additional information about significant estimates and judgments used in estimating credit losses. For public business entities, the Update is effective for annual periods beginning after December 15, 2019 and interim periods within those annual periods. The Company is currently evaluating the effects of ASU 2016-13 on its financial statements and disclosures. The Company has formed a working group and a committee made up of members of finance, credit and risk management that are in the process of compiling and analyzing key data elements and implementing a software model that will meet the requirements of the new guidance. The Company has contracted with an industry expert to: (1) develop a new expected loss model with supportable assumptions, (2) identify data, reporting, and disclosure gaps, (3) provide quantitative modeling, and (4) assess, develop and document updates to accounting policies, new processes and controls. The magnitude of the adjustment and the overall impact of the new guidance on the consolidated financial statements cannot yet be reasonably estimated. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), ASU 2018-11, Leases (Topic 842): Targeted Improvements, ASU 2018-10, Codification Improvements to Topic 842, Leases . This Update is being issued to increase the transparency and comparability around lease obligations. Previously unrecorded off-balance sheet obligations will now be recorded in the consolidated financial statements, accompanied by enhanced qualitative and quantitative disclosures in the notes to the consolidated financial statements. The Update is generally effective for public business entities in fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. In July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842, Leases and ASU 2018-11, Leases (Topic 842): Targeted Improvements . ASU 2018-10 provides improvements related to ASU 2016-02 to increase stakeholders’ awareness of the amendments to Topic 842 and to expedite the improvements. The amendments affect narrow aspects of the guidance issued in ASU 2016-02. ASU 2018-11 allows entities adopting ASU 2016-02 to choose an additional transition method, under which an entity initially applies the accounting guidance for leases under Topic 842 at the adoption date and recognizes a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Additionally, ASU 2018-11 allows an entity electing this additional transition method to continue to present comparative period financial statements in accordance with Topic 840 (current U.S. GAAP). ASU 2018-11 also allows lessors to not separate non-lease components from the associated lease component if certain conditions are met. The amendments in these updates become effective for annual periods as well as interim periods within those annual periods beginning after December 15, 2018. The Company has elected to apply the transition provisions of Topic 842 using the modified retrospective transition method, electing to adopt the “package” of practical expedients in its transition to Topic 842, as specified in ASC 842-10-65. The results of this policy election are that the Company will reflect the provisions of Topic 842 in its consolidated financial statements for the first time as of and for the period ended March 31, 2019 (the period of adoption). The Company will measure and record liabilities to make lease payments as well as right of use assets in the period of adoption for leases that existed as of the transition date, and will continue to present all comparative periods under Topic 840. Under this elected transition method, the Company is not required to reassess the following as part of its Transition to Topic 842: (1) whether any expired or existing contracts contain leases, (2) lease classifications for any existing or expired leases, and (3) initial direct costs for any existing leases. Additionally, the Company has elected to apply the use of hindsight in its assessment of the term for its leases upon transition, which allows for consideration of the Company’s option to extend or terminate a lease. The Company is currently in the process of finalizing its transition accounting under Topic 842 and anticipates in the first quarter of 2019 it will record a liability to make future lease payments of approximately $43 million and right of use assets of approximately $41 million , the difference being the net of accounting adjustments previously recorded under Topic 840 and Topic 805, as required by transition guidance in ASC 842-10-65. The Company does not currently anticipate a cumulative effect adjustment to the opening balance of retained earnings will be required as part of its transition to Topic 842. The Company’s evaluation of lease obligations and service agreements under the new standard includes an assessment of the appropriate classification and related accounting of each lease agreement, a review of applicability of the new standard to existing service agreements and gathering all essential lease data to facilitate the application of the new standard. The Company’s review indicates that all of its leases are classified as operating leases or short-term leases. In accordance with the provisions of Topic 842, liabilities to make future lease payments and right of use assets will only be recorded for leases that are not considered short-term (leases with an original term of greater than 12 months). The Company will record expense for its leases on a straight-line basis in accordance with the requirements under Topic 842 for operating leases. The Company does not currently believe expense recognition for its operating leases (including short-term leases) under Topic 842 will differ significantly from that recorded under current lease accounting guidance. Right of use assets for operating leases will be amortized over the lease term and liabilities to make future lease payments will be accounted for using the interest method, both in accordance with Topic 842.

Regulatory Capital Requiremen_2

Regulatory Capital Requirements and Other Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [Abstract]
Schedule of Company's and Bank's actual capital amounts and ratios	As defined in applicable regulations and set forth in the table below, which excludes the capital conservation buffer, at December 31, 2018 and 2017 , the Company and the Bank continue to exceed the “well capitalized” standards as well as exceed the Basel III minimum capital ratios of the conservation buffer for each of the risk-based capital ratios: Actual Minimum Required for Capital Adequacy Purposes Required to be Well Capitalized Under Prompt Corrective Action Regulations Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) At December 31, 2018 Pacific Premier Bancorp, Inc. Consolidated Tier 1 Leverage Ratio $ 1,112,132 10.38 % $ 428,751 4.00 % N/A N/A Common Equity Tier 1 to Risk-Weighted Assets 1,087,164 10.88 % 449,505 4.50 % N/A N/A Tier 1 Capital to Risk-Weighted Assets 1,112,132 11.13 % 599,340 6.00 % N/A N/A Total Capital to Risk-Weighted Assets 1,237,315 12.39 % 799,120 8.00 % N/A N/A Pacific Premier Bank Tier 1 Leverage Ratio $ 1,185,544 11.06 % $ 428,703 4.00 % $ 535,879 5.00 % Common Equity Tier 1 to Risk-Weighted Assets 1,185,544 11.87 % 449,481 4.50 % 649,251 6.50 % Tier 1 Capital to Risk-Weighted Assets 1,185,544 11.87 % 599,308 6.00 % 799,078 8.00 % Total Capital to Risk-Weighted Assets 1,226,258 12.28 % 799,078 8.00 % 998,847 10.00 % At December 31, 2017 Pacific Premier Bancorp, Inc. Consolidated Tier 1 Leverage Ratio $ 737,173 10.61 % $ 277,900 4.00 % N/A N/A Common Equity Tier 1 to Risk-Weighted Assets 717,145 10.48 % 307,818 4.50 % N/A N/A Tier 1 Capital to Risk-Weighted Assets 737,173 10.78 % 410,424 6.00 % N/A N/A Total Capital to Risk-Weighted Assets 852,382 12.46 % 547,232 8.00 % N/A N/A Pacific Premier Bank Tier 1 Leverage Ratio $ 805,110 11.59 % $ 277,870 4.00 % $ 347,337 5.00 % Common Equity Tier 1 to Risk-Weighted Assets 805,110 11.77 % 307,742 4.50 % 444,516 6.50 % Tier 1 Capital to Risk-Weighted Assets 805,110 11.77 % 410,322 6.00 % 547,096 8.00 % Total Capital to Risk-Weighted Assets 835,945 12.22 % 547,096 8.00 % 683,870 10.00 %

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of amortized cost and estimated fair value of securities	The amortized cost and estimated fair value of securities were as follows: December 31, 2018 Amortized Cost Unrealized Gain Unrealized Loss Estimated Fair Value (dollars in thousands) Investment securities available-for-sale: U.S. Treasury $ 59,688 $ 1,224 $ — $ 60,912 Agency 128,958 1,631 (519 ) 130,070 Corporate debt 104,158 291 (906 ) 103,543 Municipal bonds 238,914 1,941 (2,225 ) 238,630 Collateralized mortgage obligation: residential 24,699 64 (425 ) 24,338 Mortgage-backed securities: residential 554,751 1,112 (10,134 ) 545,729 Total investment securities available-for-sale 1,111,168 6,263 (14,209 ) 1,103,222 Investment securities held-to-maturity: Mortgage-backed securities: residential 43,381 148 (686 ) 42,843 Other 1,829 — — 1,829 Total investment securities held-to-maturity 45,210 148 (686 ) 44,672 Total investment securities $ 1,156,378 $ 6,411 $ (14,895 ) $ 1,147,894 December 31, 2017 Amortized Unrealized Unrealized Estimated Cost Gain Loss Fair Value (dollars in thousands) Investment securities available-for-sale: Agency $ 47,051 $ 236 $ (78 ) $ 47,209 Corporate debt 78,155 1,585 (194 ) 79,546 Municipal bonds 228,929 3,942 (743 ) 232,128 Collateralized mortgage obligation: residential 33,984 132 (335 ) 33,781 Mortgage-backed securities: residential 398,664 266 (4,165 ) 394,765 Total investment securities available-for-sale 786,783 6,161 (5,515 ) 787,429 Investment securities held-to-maturity: Mortgage-backed securities: residential 17,153 — (209 ) 16,944 Other 1,138 — — 1,138 Total investment securities held-to-maturity 18,291 — (209 ) 18,082 Total investment securities $ 805,074 $ 6,161 $ (5,724 ) $ 805,511
Schedule of number, fair value and gross unrealized holding losses of the Company's investment securities by investment category and length of time that the securities have been in a continuous loss position	The table below shows the number, fair value and gross unrealized holding losses of the Company’s investment securities by investment category and length of time that the securities have been in a continuous loss position. December 31, 2018 Less than 12 months 12 months or Longer Total Number Fair Value Gross Unrealized Holding Losses Number Fair Value Gross Unrealized Holding Losses Number Fair Value Gross Unrealized Holding Losses (dollars in thousands) Investment securities available-for-sale: Agency 15 26,229 (333 ) 6 10,434 (186 ) 21 36,663 (519 ) Corporate debt 9 47,805 (471 ) 8 19,369 (435 ) 17 67,174 (906 ) Municipal bonds 60 45,083 (369 ) 102 69,693 (1,856 ) 162 114,776 (2,225 ) Collateralized mortgage obligation: residential 1 814 (1 ) 8 18,104 (424 ) 9 18,918 (425 ) Mortgage-backed securities: residential 20 70,839 (435 ) 120 324,864 (9,699 ) 140 395,703 (10,134 ) Total investment securities available-for-sale 105 190,770 (1,609 ) 244 442,464 (12,600 ) 349 633,234 (14,209 ) Investment securities held-to-maturity: Mortgage-backed securities: residential 3 11,256 (81 ) 3 15,741 (605 ) 6 26,997 (686 ) Other — — — — — — — — — Total investment securities held-to-maturity 3 11,256 (81 ) 3 15,741 (605 ) 6 26,997 (686 ) Total investment securities 108 $ 202,026 $ (1,690 ) 247 $ 458,205 $ (13,205 ) 355 $ 660,231 $ (14,895 ) December 31, 2017 Less than 12 months 12 months or Longer Total Number Fair Gross Number Fair Gross Number Fair Gross (dollars in thousands) Investment securities available-for-sale: Agency 6 $ 13,754 $ (78 ) — $ — $ — 6 $ 13,754 $ (78 ) Corporate debt 4 10,079 (64 ) 2 6,076 (130 ) 6 16,155 (194 ) Municipal bonds 103 61,313 (268 ) 30 15,658 (475 ) 133 76,971 (743 ) Collateralized mortgage obligation: residential 5 13,971 (149 ) 3 8,943 (186 ) 8 22,914 (335 ) Mortgage-backed securities: residential 66 220,951 (1,600 ) 41 110,062 (2,565 ) 107 331,013 (4,165 ) Total available-for-sale 184 320,068 (2,159 ) 76 140,739 (3,356 ) 260 460,807 (5,515 ) Investment securities held-to-maturity: Mortgage-backed securities: residential 2 10,745 (133 ) 1 6,198 (76 ) 3 16,943 (209 ) Other — — — — — — — — — Total held-to-maturity 2 10,745 (133 ) 1 6,198 (76 ) 3 16,943 (209 ) Total securities 186 $ 330,813 $ (2,292 ) 77 $ 146,937 $ (3,432 ) 263 $ 477,750 $ (5,724 )
Schedule of amortized cost and estimated fair value of investment securities available for sale by contractual maturity	The amortized cost and estimated fair value of investment securities available for sale at December 31, 2018 , by contractual maturity are shown in the table below. One Year or Less More than One Year to Five Years More than Five Years to Ten Years More than Ten Years Total Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value (dollars in thousands) Investment securities available-for-sale: Treasury $ — $ — $ 10,407 $ 10,606 $ 49,281 $ 50,306 $ — $ — $ 59,688 $ 60,912 Agency 992 991 35,103 35,769 74,149 74,926 18,714 18,384 128,958 130,070 Corporate — — — — 104,158 103,543 — — 104,158 103,543 Municipal bonds 5,271 5,264 29,715 29,704 70,354 69,581 133,574 134,081 238,914 238,630 Collateralized mortgage obligation: residential — — — — 815 814 23,884 23,524 24,699 24,338 Mortgage-backed securities: residential — — 1,569 1,527 162,855 161,964 390,327 382,238 554,751 545,729 Total investment securities available-for-sale 6,263 6,255 76,794 77,606 461,612 461,134 566,499 558,227 1,111,168 1,103,222 Investment securities held-to-maturity: Mortgage-backed securities: residential — — 928 942 — — 42,453 41,901 43,381 42,843 Other — — — — — — 1,829 1,829 1,829 1,829 Total investment securities held-to-maturity — — 928 942 — — 44,282 43,730 45,210 44,672 Total investment securities $ 6,263 $ 6,255 $ 77,722 $ 78,548 $ 461,612 $ 461,134 $ 610,781 $ 601,957 $ 1,156,378 $ 1,147,894

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Schedule of components of loans held for investment	The following table presents the composition of the loan portfolio as of the dates indicated: For the Years Ended December 31, 2018 2017 (dollars in thousands) Business loans: Commercial and industrial $ 1,364,423 $ 1,086,659 Franchise 765,416 660,414 Commercial owner occupied 1,679,122 1,289,213 SBA 193,882 185,514 Agribusiness 138,519 116,066 Total business loans 4,141,362 3,337,866 Real estate loans: Commercial non-owner occupied 2,003,174 1,243,115 Multi-family 1,535,289 794,384 One-to-four family 356,264 270,894 Construction 523,643 282,811 Farmland 150,502 145,393 Land 46,628 31,233 Total real estate loans 4,615,500 2,767,830 Consumer loans: Consumer loans 89,424 92,931 Gross loans held for investment 8,846,286 6,198,627 Deferred loan origination fees and discounts, net (9,468 ) (2,403 ) Loans held for investment 8,836,818 6,196,224 Allowance for loan losses (36,072 ) (28,936 ) Loans held for investment, net $ 8,800,746 $ 6,167,288 Loans held for sale, at lower of cost or fair value $ 5,719 $ 23,426
Summary of Company's investment in purchased credit impaired loans	The carrying amount of those loans at December 31, 2018 and 2017 was as follows: For the Years Ended December 31, 2018 2017 (dollars in thousands) Business loans: Commercial and industrial $ 10 $ 3,310 Commercial owner occupied 632 1,262 SBA 1,265 1,802 Total business loans 1,907 6,374 Real estate loans: Commercial non-owner occupied 275 1,650 One-to-four family — 255 Construction — 517 Land — 83 Total real estate loans 275 2,505 Consumer loans: Consumer loans — 10 Total purchase credit impaired $ 2,182 $ 8,889
Summary of accretable yield on purchased credit impaired	The following table summarizes the accretable yield on the purchased credit impaired for the years ended December 31, 2018 , 2017 and 2016 : For the Years Ended December 31, 2018 2017 2016 (dollars in thousands) Balance at the beginning of period $ 3,019 $ 3,747 $ 2,726 Additions 1,430 3,102 788 Accretion (532 ) (2,037 ) (1,354 ) Payoffs (1,688 ) (2,125 ) 165 Sales (1,818 ) — — Reclassification from nonaccretable difference — 332 1,422 Balance at the end of period $ 411 $ 3,019 $ 3,747
Summary of Company's investment in impaired loans	The following tables provide a summary of the Company’s investment in impaired loans as of and for the periods indicated: Recorded Investment Unpaid Principal Balance With Specific Allowance Without Specific Allowance Specific Allowance for Impaired Loans Average Recorded Investment Interest Income Recognized (dollars in thousands) December 31, 2018 Business loans Commercial and industrial $ 1,023 $ 1,071 $ 550 $ 473 $ 118 $ 1,173 $ 1 Franchise 189 190 — 189 — 119 — Commercial owner occupied 599 628 — 599 — 1,549 — SBA 2,739 7,598 488 2,251 466 1,814 — Agribusiness 7,500 7,500 — 7,500 — 625 35 Real estate loans Commercial non-owner occupied — — — — — 538 — Multi-family — — — — — 500 — One-to-four family 408 453 — 408 — 1,206 — Land — — — — — 5 — Consumer loans Consumer — — — — — 33 — Totals $ 12,458 $ 17,440 $ 1,038 $ 11,420 $ 584 $ 7,562 $ 36 December 31, 2017 Business loans Commercial and industrial $ 1,160 $ 1,585 $ — $ 1,160 $ — $ 441 $ — Commercial owner occupied 97 98 97 — 55 153 — SBA 1,201 4,329 — 1,201 — 434 — Real estate loans Commercial non-owner occupied — — — — — 86 — One-to-four family 817 849 — 817 — 166 — Construction — — — — — 1,017 — Land 9 35 — 9 — 12 — Totals $ 3,284 $ 6,896 $ 97 $ 3,187 $ 55 $ 2,309 $ — December 31, 2016 Business loans Commercial and industrial $ 250 $ 1,990 $ 250 $ — $ 250 $ 864 $ 76 Franchise — — — — — 1,016 68 Commercial owner occupied 436 847 — 436 — 505 37 SBA 316 3,865 — 316 — 331 23 Real estate loans Commercial non-owner occupied — — — — — 1,072 93 One-to-four family 124 291 — 124 — 226 18 Land 15 36 — 15 — 18 2 Totals $ 1,141 $ 7,029 $ 250 $ 891 $ 250 $ 4,032 $ 317
Summary of loan portfolio by the Company's internal risk grading system	The following tables stratify the loan portfolio by the Company’s internal risk grading system as well as certain other information concerning the credit quality of the loan portfolio, including loans held for sale, as of the periods indicated: Credit Risk Grades Pass Special Mention Substandard Doubtful Total Gross Loans December 31, 2018 (dollars in thousands) Business loans Commercial and industrial $ 1,340,322 $ 12,005 $ 12,134 $ — $ 1,364,461 Franchise 760,795 4,431 190 — 765,416 Commercial owner occupied 1,660,994 1,580 16,548 — 1,679,122 SBA 189,006 2,289 6,906 — 198,201 Agribusiness 125,355 — 13,164 — 138,519 Real estate loans Commercial non-owner occupied 1,998,118 731 5,687 — 2,004,536 Multi-family 1,530,567 4,060 662 — 1,535,289 One-to-four family 350,083 728 5,453 — 356,264 Construction 523,643 — — — 523,643 Farmland 150,381 — 121 — 150,502 Land 46,008 132 488 — 46,628 Consumer loans Consumer loans 89,321 — 103 — 89,424 Totals $ 8,764,593 $ 25,956 $ 61,456 $ — $ 8,852,005 Credit Risk Grades Pass Special Mention Substandard Doubtful Total Gross Loans December 31, 2017 (dollars in thousands) Business loans Commercial and industrial $ 1,063,452 $ 8,163 $ 15,044 $ — $ 1,086,659 Franchise 660,415 — — — 660,415 Commercial owner occupied 1,273,380 654 21,180 — 1,295,214 SBA 199,468 1 3,469 — 202,938 Warehouse facilities 108,143 4,079 3,844 — 116,066 Real estate loans Commercial non-owner occupied 1,242,045 — 1,070 — 1,243,115 Multi-family 794,156 — 228 — 794,384 One-to-four family 268,776 154 1,964 — 270,894 Construction 282,294 517 — — 282,811 Farmland 144,234 44 1,115 — 145,393 Land 30,979 — 254 — 31,233 Consumer loans Consumer loans 92,794 — 137 — 92,931 Totals $ 6,160,136 $ 13,612 $ 48,305 $ — $ 6,222,053
Schedule of credit quality of the loan portfolio	Days Past Due Current 30-59 60-89 90+ Total Gross Loans Non-accruing December 31, 2018 (dollars in thousands) Business loans Commercial and industrial $ 1,362,017 $ 309 $ 1,204 $ 931 $ 1,364,461 $ 931 Franchise 759,546 5,680 — 190 765,416 190 Commercial owner occupied 1,677,967 343 — 812 1,679,122 599 SBA 195,051 524 — 2,626 198,201 2,739 Agribusiness 138,519 — — — 138,519 — Real estate loans Commercial non-owner occupied 2,004,536 — — — 2,004,536 — Multi-family 1,535,275 14 — — 1,535,289 — One-to-four family 356,219 30 9 6 356,264 398 Construction 523,643 — — — 523,643 — Farmland 150,502 — — — 150,502 — Land 46,628 — — — 46,628 — Consumer loans Consumer loans 89,249 146 29 — 89,424 — Totals $ 8,839,152 $ 7,046 $ 1,242 $ 4,565 $ 8,852,005 $ 4,857 Days Past Due Current 30-59 60-89 90+ Total Gross Loans Non-accruing December 31, 2017 (dollars in thousands) Business loans Commercial and industrial $ 1,085,770 $ 84 $ 570 $ 235 $ 1,086,659 $ 1,160 Franchise 660,415 — — — 660,415 — Commercial owner occupied 1,291,254 3,474 486 — 1,295,214 97 SBA 200,821 177 — 1,940 202,938 1,201 Warehouse facilities 116,066 — — — 116,066 — Real estate loans Commercial non-owner occupied 1,243,115 — — — 1,243,115 — Multi-family 792,603 1,781 — — 794,384 — One-to-four family 269,725 354 — 815 270,894 817 Construction 282,811 — — — 282,811 — Farmland 145,393 — — — 145,393 — Land 31,141 83 — 9 31,233 9 Consumer loans Consumer loans 92,880 11 — 40 92,931 — Totals $ 6,211,994 $ 5,964 $ 1,056 $ 3,039 $ 6,222,053 $ 3,284

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2018
Provision for Loan and Lease Losses [Abstract]
Summary of allocation of the allowance as well as the activity in the allowance attributed to various segments in the loan portfolio	The following tables summarize the allocation of the allowance as well as the activity in the allowance attributed to various segments in the loan portfolio as of and for the periods indicated: Commercial and Industrial Franchise Commercial Owner Occupied SBA Agribusiness Warehouse Facilities Commercial Non-owner Occupied Multi-family One-to-four Family Construction Farmland Land Consumer Loans Total (dollars in thousands) Balance, December 31, 2017 $ 9,721 $ 5,797 $ 767 $ 2,890 $ 1,291 $ — $ 1,266 $ 607 $ 803 $ 4,569 $ 137 $ 993 $ 95 $ 28,936 Charge-offs (1,411 ) — (33 ) (102 ) — — — — — — — — (409 ) (1,955 ) Recoveries 698 — 47 169 — — — — 13 — — — 8 935 Provisions for (reduction in) loan losses 1,813 703 605 1,331 1,992 — 338 118 (11 ) 597 366 (221 ) 525 8,156 Balance, December 31, 2018 $ 10,821 $ 6,500 $ 1,386 $ 4,288 $ 3,283 $ — $ 1,604 $ 725 $ 805 $ 5,166 $ 503 $ 772 $ 219 $ 36,072 Amount of allowance attributed to: Specifically evaluated impaired loans $ 118 $ — $ — $ 466 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ 584 General portfolio allocation 10,703 6,500 1,386 3,822 3,283 — 1,604 725 805 5,166 503 772 219 35,488 Loans individually evaluated for impairment 1,023 189 599 2,739 7,500 — — — 408 — — — — 12,458 Specific reserves to total loans individually evaluated for impairment 11.53 % — % — % 17.01 % — % — % — % — % — % — % — % — % — % 4.69 % Loans collectively evaluated for impairment $ 1,363,400 $ 765,227 $ 1,678,523 $ 191,143 $ 131,019 $ — $ 2,003,174 $ 1,535,289 $ 355,856 $ 523,643 $ 150,502 $ 46,628 $ 89,424 $ 8,833,828 General reserves to total loans collectively evaluated for impairment 0.79 % 0.85 % 0.08 % 2.00 % 2.51 % — % 0.08 % 0.05 % 0.23 % 0.99 % 0.33 % 1.66 % 0.24 % 0.40 % Total gross loans $ 1,364,423 $ 765,416 $ 1,679,122 $ 193,882 $ 138,519 $ — $ 2,003,174 $ 1,535,289 $ 356,264 $ 523,643 $ 150,502 $ 46,628 $ 89,424 $ 8,846,286 Total allowance to gross loans 0.79 % 0.85 % 0.08 % 2.21 % 2.37 % — % 0.08 % 0.05 % 0.23 % 0.99 % 0.33 % 1.66 % 0.24 % 0.41 % Commercial and Industrial Franchise Commercial Owner Occupied SBA Agribusiness Warehouse Facilities Commercial Non-owner Occupied Multi-family One-to-four Family Construction Farmland Land Consumer Loans Total (dollars in thousands) Balance, December 31, 2016 $ 6,362 $ 3,845 $ 1,193 $ 1,039 $ — $ — $ 1,715 $ 2,927 $ 365 $ 3,632 $ — $ 198 $ 20 $ 21,296 Charge-offs (1,344 ) — — (8 ) — — — — (10 ) — — — — (1,362 ) Recoveries 94 — 105 127 — — — — 35 — — — 1 362 Provisions for (reduction in) loan losses 4,609 1,952 (531 ) 1,732 1,291 — (449 ) (2,320 ) 413 937 137 795 74 8,640 Balance, December 31, 2017 $ 9,721 $ 5,797 $ 767 $ 2,890 $ 1,291 $ — $ 1,266 $ 607 $ 803 $ 4,569 $ 137 $ 993 $ 95 $ 28,936 Amount of allowance attributed to: Specifically evaluated impaired loans $ — $ — $ 55 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ 55 General portfolio allocation 9,721 5,797 712 2,890 1,291 — 1,266 607 803 4,569 137 993 95 28,881 Loans individually evaluated for impairment 1,160 — 97 1,201 — — — — 817 — — 9 — 3,284 Specific reserves to total loans individually evaluated for impairment — % — % 56.70 % — % — % — % — % — % — % — % — % — % — % 1.67 % Loans collectively evaluated for impairment $ 1,085,499 $ 660,414 $ 1,289,116 $ 184,313 $ 116,066 $ — $ 1,243,115 $ 794,384 $ 270,077 $ 282,811 $ 145,393 $ 31,224 $ 92,931 $ 6,195,343 General reserves to total loans collectively evaluated for impairment 0.90 % 0.88 % 0.06 % 1.57 % 1.11 % — % 0.10 % 0.08 % 0.30 % 1.62 % 0.09 % 3.18 % 0.10 % 0.47 % Total gross loans $ 1,086,659 $ 660,414 $ 1,289,213 $ 185,514 $ 116,066 $ — $ 1,243,115 $ 794,384 $ 270,894 $ 282,811 $ 145,393 $ 31,233 $ 92,931 $ 6,198,627 Total allowance to gross loans 0.89 % 0.88 % 0.06 % 1.56 % 1.11 % — % 0.10 % 0.08 % 0.30 % 1.62 % 0.09 % 3.18 % 0.10 % 0.47 % Commercial Franchise Commercial SBA Agribusiness Warehouse Facilities Commercial Multi-family One-to-four Construction Farmland Land Consumer Loans Total Balance, December 31, 2015 $ 3,449 $ 3,124 $ 1,870 $ 1,500 $ — $ 759 $ 2,048 $ 1,583 $ 698 $ 2,030 $ — $ 233 $ 23 $ 17,317 Charge-offs (2,802 ) (980 ) (329 ) (980 ) — — — — (151 ) — — — — (5,242 ) Recoveries 177 — 25 193 — — 21 — 25 — — — 4 445 Provisions for (reduction in) loan losses 5,538 1,701 (373 ) 326 — (759 ) (354 ) 1,344 (207 ) 1,602 — (35 ) (7 ) 8,776 Balance, December 31, 2016 $ 6,362 $ 3,845 $ 1,193 $ 1,039 $ — $ — $ 1,715 $ 2,927 $ 365 $ 3,632 $ — $ 198 $ 20 $ 21,296 Amount of allowance attributed to: Specifically evaluated impaired loans $ 250 $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — $ 250 General portfolio allocation 6,112 3,845 1,193 1,039 — — 1,715 2,927 365 3,632 — 198 20 21,046 Loans individually evaluated for impairment 250 — 436 316 — — — — 124 — — 15 — 1,141 Specific reserves to total loans individually evaluated for impairment 100.00 % — % — % — % — % — % — % — % — % — % — % — % — % 21.91 % Loans collectively evaluated for impairment $ 562,919 $ 459,421 $ 454,482 $ 88,678 $ — $ — $ 586,975 $ 690,955 $ 100,327 $ 269,159 $ — $ 19,814 $ 4,112 $ 3,236,842 General reserves to total loans collectively evaluated for impairment 1.09 % 0.84 % 0.26 % 1.17 % — % — % 0.29 % 0.42 % 0.36 % 1.35 % — % 1.00 % 0.49 % 0.65 % Total gross loans $ 563,169 $ 459,421 $ 454,918 $ 88,994 $ — $ — $ 586,975 $ 690,955 $ 100,451 $ 269,159 $ — $ 19,829 $ 4,112 $ 3,237,983 Total allowance to gross loans 1.13 % 0.84 % 0.26 % 1.17 % — % — % 0.29 % 0.42 % 0.36 % 1.35 % — % 1.00 % 0.49 % 0.66 %

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2018
Other Real Estate [Abstract]
Summary of the activity in the other real estate owned	The following summarizes the activity in the other real estate owned for the years ended December 31: 2018 2017 2016 (dollars in thousands) Balance, beginning of year $ 326 $ 460 $ 1,161 Additions: Acquisitions 524 326 197 Foreclosures 15 — — Sales (1,055 ) (507 ) (577 ) Gain (loss) on sale 346 47 18 Write downs (9 ) — (339 ) Balance, end of year $ 147 $ 326 $ 460

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Schedule of components of premises and equipment	The Company’s premises and equipment consisted of the following at December 31: 2018 2017 (dollars in thousands) Land $ 18,902 $ 16,920 Premises 25,361 19,868 Leasehold improvements 15,824 14,025 Furniture, fixtures and equipment 28,994 20,480 Automobiles 173 187 Subtotal 89,254 71,480 Less: accumulated depreciation 24,563 18,325 Total $ 64,691 $ 53,155

Goodwill and Core Deposit Int_2

Goodwill and Core Deposit Intangibles (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table presents changes in the carrying value of goodwill for the periods indicated: 2018 2017 2016 (dollars in thousands) Balance, beginning of year $ 493,329 $ 102,490 $ 50,832 Goodwill acquired during the year 313,043 390,839 51,658 Purchase Accounting Adjustments 2,354 — — Impairment losses — — — Balance, end of year $ 808,726 $ 493,329 $ 102,490 Accumulated impairment losses at end of year $ — $ — $ —
Schedule of Finite-Lived Intangible Assets	he Company’s change in the gross amount of core deposit intangibles and the related accumulated amortization consisted of the following at December 31: 2018 2017 2016 (dollars in thousands) Gross amount of CDI: Balance, beginning of year $ 54,809 $ 15,102 $ 10,782 Additions due to acquisitions 71,136 39,707 4,320 Balance, end of year 125,945 54,809 15,102 Accumulated amortization: Balance, beginning of year (11,795 ) (5,651 ) (3,612 ) Amortization (13,594 ) (6,144 ) (2,039 ) Balance, end of year (25,389 ) (11,795 ) (5,651 ) Net CDI, end of year $ 100,556 $ 43,014 $ 9,451

Qualified Affordable Housing _2

Qualified Affordable Housing Project Investments (Tables)	12 Months Ended
	Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Investment in LIHTC Projects	The following table presents the Company’s original investment in the LIHTC funds, the current recorded investment balance, and the unfunded liability balance of each investment at December 31, 2018 and 2017 . In addition, the table reflects the tax credits and tax benefits recorded by the Company during 2018 and 2017 , the amortization of the investment and the net impact to the Company’s income tax provision for 2018 and 2017 . Original Investment Value Current Recorded Investment Unfunded Liability Obligation Tax Credits and Tax Deductions (1) Amortization of Investments (2) Net Income Tax Benefit December 31, 2018 (dollars in thousands) WNC Institutional Tax Credit $ 5,000 $ 2,250 $ — $ 715 $ 500 $ (675 ) WNC Institutional Tax Credit 5,000 2,750 136 786 500 (703 ) Sycamore Court 6,181 4,580 927 1,141 1,003 (766 ) R4 CA Housing 15,000 13,426 9,405 4,721 1,574 (1,950 ) Cypress Cove 20,000 16,401 2,914 1,621 997 (1,113 ) Total - Investments in $ 51,181 $ 39,407 $ 13,382 $ 8,984 $ 4,574 $ (5,207 ) Original Investment Value Current Recorded Investment Unfunded Liability Obligation Tax Credits and Tax Deductions (1) Amortization of Investments (2) Net Income Tax Benefit December 31, 2017 WNC Institutional Tax Credit $ 5,000 $ 2,750 $ 85 $ 455 $ 500 $ (663 ) WNC Institutional Tax Credit 5,000 3,250 288 482 500 (690 ) Sycamore Court 6,181 5,582 927 1,577 599 (782 ) Total - Investments in $ 16,181 $ 11,582 $ 1,300 $ 2,514 $ 1,599 $ (2,135 ) (1) The amounts reflected in this column represent both the tax credits, as well as the tax benefits generated by the Qualified Affordable Housing Projects operating loss for the year, which are included in the calculation of income tax expense. (2) This amount represents the amortization of the investment cost of the LIHTC.

Deposit Accounts (Tables)

Deposit Accounts (Tables)	12 Months Ended
	Dec. 31, 2018
Deposits [Abstract]
Schedule of components of deposit accounts and weighted average interest rates	Deposit accounts and weighted average interest rates consisted of the following at December 31: 2018 Weighted 2017 Weighted (dollars in thousands) Transaction accounts Noninterest-bearing checking $ 3,495,737 — % $ 2,226,876 — % Interest-bearing checking 526,088 0.38 % 365,193 0.13 % Money market 2,975,578 0.89 % 2,181,571 0.48 % Savings 250,271 0.14 % 227,436 0.13 % Total transaction accounts 7,247,674 0.37 % 5,001,076 0.21 % Certificates of deposit accounts 250,000 or less 569,877 1.44 % 562,147 0.96 % Greater than $250,000 840,800 2.12 % 522,663 1.26 % Total certificates of deposit accounts 1,410,677 1.84 % 1,084,810 1.10 % Total deposits $ 8,658,351 0.63 % $ 6,085,886 0.33 %
Schedule of aggregate annual maturities of certificates of deposit accounts	The aggregate annual maturities of certificates of deposit accounts at December 31, 2018 are as follows: 2018 Balance Weighted Average Interest Rate (dollars in thousands) Within 3 months $ 479,572 1.88 % 4 to 6 months 365,578 2.03 % 7 to 12 months 264,838 1.68 % 13 to 24 months 179,590 1.92 % 25 to 36 months 43,103 2.01 % 37 to 60 months 13,380 1.74 % Over 60 months 64,616 0.92 % Total $ 1,410,677 1.84 %
Schedule of interest expense on deposit accounts	Interest expense on deposit accounts for the years ended December 31 is summarized as follows: 2018 2017 2016 (dollars in thousands) Checking accounts $ 1,167 $ 365 $ 200 Money market accounts 19,567 6,720 3,641 Savings 357 251 151 Certificates of deposit accounts 16,562 6,035 4,399 Total $ 37,653 $ 13,371 $ 8,391

Federal Home Loan Bank Advanc_2

Federal Home Loan Bank Advances and Other Borrowings (Tables)	12 Months Ended
	Dec. 31, 2018
Long-term Federal Home Loan Bank Advances [Abstract]
Summary of activities in advances from the FHLB	The following table summarizes activities in advances from the FHLB for the periods indicated: Year Ended December 31, 2018 2017 (dollars in thousands) Average balance outstanding $ 529,278 $ 290,839 Maximum amount outstanding at any month-end during the year 883,612 490,148 Balance outstanding at end of year 667,606 490,148 Weighted average interest rate during the year 2.51 % 1.19 %
Summary of activities in other borrowings	The following table summarizes activities in other borrowings for the periods indicated: Year Ended December 31, 2018 2017 (dollars in thousands) Average balance outstanding $ 29,193 $ 50,866 Maximum amount outstanding at any month-end during the year 52,091 52,996 Balance outstanding at end of year 75 46,139 Weighted average interest rate during the year 0.01 % 1.86 %

Subordinated Debentures (Tables

Subordinated Debentures (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule of summarizes activities for our subordinated debentures	The following table summarizes activities for our subordinated debentures for the periods indicated: Year Ended December 31, 2018 2017 (dollars in thousands) Average balance outstanding $ 107,732 $ 81,466 Maximum amount outstanding at any month-end during the year 110,313 105,123 Balance outstanding at end of year 110,313 105,123 Weighted average interest rate during the year 6.23 % 5.80 %

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of components of income taxes	Income taxes for the years ended December 31 consisted of the following: 2018 2017 2016 (dollars in thousands) Current income tax provision: Federal $ 19,787 $ 18,644 $ 16,928 State 13,178 7,062 4,655 Total current income tax provision 32,965 25,706 21,583 Deferred income tax provision (benefit): Federal 8,142 8,294 2,379 Effect of Tax Act (1,441 ) 5,633 — State 2,574 2,493 1,253 Total deferred income tax provision (benefit) 9,275 16,420 3,632 Total income tax provision $ 42,240 $ 42,126 $ 25,215
Schedule of reconciliation from statutory federal income taxes to the Company's effective income taxes	A reconciliation from statutory federal income taxes, which are based on a statutory rate of 21% for 2018 and 35% for 2017 and 2016 , to the Company’s effective income taxes for the years ended December 31 is as follows: 2018 2017 2016 (dollars in thousands) Statutory federal income tax provision $ 34,803 $ 35,778 $ 22,863 State taxes, net of federal income tax effect 12,724 6,720 4,135 Cash surrender life insurance (582 ) (645 ) (407 ) Tax exempt interest (1,135 ) (1,660 ) (764 ) Merger costs 375 824 533 LIHTC investments (761 ) (1,031 ) (909 ) Effect of the Tax Act (1,441 ) 5,633 — Excess tax benefit of stock-based compensation (1,811 ) (1,995 ) — Prior year true-up — (1,108 ) — Other 68 (390 ) (236 ) Total income tax provision $ 42,240 $ 42,126 $ 25,215
Schedule of deferred tax assets (liabilities) comprised of the temporary differences between the financial statement carrying amounts and the tax basis of assets	Deferred tax assets (liabilities) were comprised of the following temporary differences between the financial statement carrying amounts and the tax basis of assets at December 31: 2018 2017 2016 (dollars in thousands) Deferred tax assets: Accrued expenses $ 3,239 $ 2,463 $ 2,839 Net operating loss 6,115 4,834 3,977 Allowance for loan losses, net of bad debt charge-offs 10,709 8,400 8,061 Deferred compensation 3,649 3,074 2,348 State taxes 2,707 1,500 1,879 Depreciation — — 1,090 Loan discount 17,677 8,642 3,477 Stock-based compensation 3,234 1,914 1,108 Unrealized loss on available for sale securities 2,308 — 1,939 Capital loss carryover — 380 — AMT credit 96 107 — Total deferred tax assets 49,734 31,314 26,718 Deferred tax liabilities: Deferred FDIC gain (364 ) (524 ) (1,675 ) Core deposit intangibles (27,388 ) (11,691 ) (3,331 ) Loan origination costs (4,760 ) (3,368 ) (4,208 ) Depreciation (1,192 ) (699 ) — Unrealized gain on available for sale securities — (188 ) — Other (403 ) (1,199 ) (697 ) Total deferred tax liabilities (34,107 ) (17,669 ) (9,911 ) Valuation allowance — (380 ) — Net deferred tax asset $ 15,627 $ 13,265 $ 16,807
Reconciliation of unrecognized tax benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits for the years ended December 31, 2018 and 2017 is as follows: 2018 2017 (dollars in thousands) Balance at January 1, $ 2,906 $ — Additions based on tax positions related to prior years — 2,906 Balance at December 31, $ 2,906 $ 2,906

Commitments, Contingencies an_2

Commitments, Contingencies and Concentrations of Risk (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of minimum annual lease payments, excluding any renewals and extensions, property taxes, and other operating expenses, due under the agreements	The following schedule shows the minimum annual lease payments, excluding any renewals and extensions, property taxes, and other operating expenses, due under these agreements: Year ending December 31, Amount (dollars in thousands) 2019 $ 11,468 2020 10,869 2021 10,133 2022 9,296 2023 8,124 Thereafter 10,518 Total $ 60,408

Benefit Plans (Tables)

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Summary of the activity in the Option Plan	Below is a summary of the stock option activity in the Plans for the year ended December 31, 2018 : 2018 Number of Stock Options Outstanding Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Term Aggregate Intrinsic value (in years) (dollars in thousands) Outstanding at January 1, 2018 954,523 $ 13.89 Granted — — Exercised (255,178 ) 9.71 Forfeited and Expired (17,412 ) 21.53 Outstanding at December 31, 2018 681,933 $ 15.26 5.26 $ 6,962 Vested and Exercisable at December 31, 2018 635,396 $ 15.11 5.04 $ 6,715
Schedule of Other Share-based Compensation, Activity	Below is a summary of the restricted stock activity in the Plans for the years ended December 31, 2018 : 2018 Shares Weighted Average Grant-Date Fair Value per share Unvested at the beginning of the year 446,843 $ 29.61 Granted 328,358 41.92 Vested (125,038 ) 28.53 Forfeited (14,086 ) 38.18 Unvested at the end of the year 636,077 $ 35.98

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of carrying amount and estimated fair value of financial instruments	At December 31, 2018 Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value (dollars in thousands) Assets: Cash and cash equivalents $ 203,406 $ 203,406 $ — $ — $ 203,406 Interest-bearing time deposits with financial institutions 6,143 6,143 — — 6,143 Investments held to maturity 45,210 — 44,672 — 44,672 Investment securities available-for-sale 1,103,222 — 1,103,222 — 1,103,222 Loans held for sale 5,719 — 6,072 — 6,072 Loans held for investment, net 8,836,818 — — 8,697,594 8,697,594 Derivative asset 1,929 — 1,681 — 1,681 Accrued interest receivable 37,837 37,837 — — 37,837 Liabilities: Deposit accounts 8,658,351 7,247,673 1,403,524 — 8,651,197 FHLB advances 667,606 — 666,864 — 666,864 Other borrowings 75 — 75 — 75 Subordinated debentures 110,313 — 115,613 — 115,613 Derivative liability 1,929 — 1,681 — 1,681 Accrued interest payable 3,255 3,255 — — 3,255
Schedule of Off-balance sheet commitments and standby letters of credit	At December 31, 2018 Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value (dollars in thousands) Assets: Cash and cash equivalents $ 203,406 $ 203,406 $ — $ — $ 203,406 Interest-bearing time deposits with financial institutions 6,143 6,143 — — 6,143 Investments held to maturity 45,210 — 44,672 — 44,672 Investment securities available-for-sale 1,103,222 — 1,103,222 — 1,103,222 Loans held for sale 5,719 — 6,072 — 6,072 Loans held for investment, net 8,836,818 — — 8,697,594 8,697,594 Derivative asset 1,929 — 1,681 — 1,681 Accrued interest receivable 37,837 37,837 — — 37,837 Liabilities: Deposit accounts 8,658,351 7,247,673 1,403,524 — 8,651,197 FHLB advances 667,606 — 666,864 — 666,864 Other borrowings 75 — 75 — 75 Subordinated debentures 110,313 — 115,613 — 115,613 Derivative liability 1,929 — 1,681 — 1,681 Accrued interest payable 3,255 3,255 — — 3,255
Schedule of Company's assets measured at fair value on a recurring basis	The following fair value hierarchy tables present information about the Company’s assets measured at fair value on a recurring basis at the dates indicated: At December 31, 2018 Fair Value Measurement Using Level 1 Level 2 Level 3 Securities at Fair Value (dollars in thousands) Financial assets Investment securities available for sale: U.S. Treasury $ — $ 60,912 $ — $ 60,912 Agency $ — $ 130,070 $ — $ 130,070 Corporate — 103,543 — 103,543 Municipal bonds — 238,630 — 238,630 Collateralized mortgage obligation: residential — 24,338 — 24,338 Mortgage-backed securities: residential — 545,729 — 545,729 Total securities available for sale: $ — $ 1,103,222 $ — $ 1,103,222 Derivative assets $ — $ 1,681 $ — $ 1,681 Financial liabilities Derivative liabilities $ — $ 1,681 $ — $ 1,681 At December 31, 2017 Fair Value Measurement Using Level 1 Level 2 Level 3 Securities at Fair Value (dollars in thousands) Financial assets Investment securities available for sale: Agency $ — $ 47,209 $ — $ 47,209 Corporate $ — $ 79,546 $ — $ 79,546 Municipal bonds — 232,128 — 232,128 Collateralized mortgage obligation: residential — 33,781 — 33,781 Mortgage-backed securities: residential — 394,765 — 394,765 Total securities available for sale: $ — $ 787,429 $ — $ 787,429 Derivative assets $ — $ 1,135 $ — $ 1,135 Financial liabilities Derivative liabilities $ — $ 1,135 $ — $ 1,135

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Schedule of Company's unaudited earnings per share calculations	A reconciliation of the numerators and denominators used in basic and diluted earnings per share computations is presented in the table below. Income/(Loss) (numerator) Shares (denominator) Per Share Amount (dollars in thousands, except share data) For the year ended December 31, 2018: Net income applicable to earnings per share $ 123,340 Basic earnings per share: Income available to common stockholders 123,340 53,963,047 $ 2.29 Effect of dilutive securities: Warrants and stock option plans — 650,010 Diluted earnings per share: Income available to common stockholders $ 123,340 54,613,057 $ 2.26 For the year ended December 31, 2017: Net income applicable to earnings per share $ 60,100 Basic earnings per share: Income available to common stockholders 60,100 37,705,556 $ 1.59 Effect of dilutive securities: Warrants and stock option plans — 805,705 Diluted earnings per share: Income available to common stockholders $ 60,100 38,511,261 $ 1.56 For the year ended December 31, 2016: Net income applicable to earnings per share $ 40,103 Basic earnings per share: Income available to common stockholders 40,103 26,931,634 $ 1.49 Effect of dilutive securities: Warrants and stock option plans — 507,525 Diluted earnings per share: Income available to common stockholders $ 40,103 27,439,159 $ 1.46

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The Company’s derivative instruments were acquired as part of the 2017 HEOP acquisition, and the Company did not have any at December 31, 2016: December 31, 2018 Derivative Assets Derivative Liabilities Notional Fair Value Notional Fair Value (dollars in thousands) Derivative instruments not designated as hedging instruments: Interest rate swap contracts $ 57,502 $ 1,681 $ 57,502 $ 1,681 Total derivative instruments $ 57,502 $ 1,681 $ 57,502 $ 1,681 December 31, 2017 Derivative Assets Derivative Liabilities Notional Fair Value Notional Fair Value (dollars in thousands) Derivative instruments not designated as hedging instruments: Interest rate swap contracts $ 58,599 $ 1,135 $ 58,599 $ 1,135 Total derivative instruments $ 58,599 $ 1,135 $ 58,599 $ 1,135

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	12 Months Ended
	Dec. 31, 2018
Offsetting [Abstract]
Offsetting Assets and Liabilities	Financial instruments that are eligible for offset in the consolidated statements of financial condition as of December 31, 2018 are presented in the table below: December 31, 2018 Gross Amounts Not Offset in the Consolidated Gross Amounts Recognized in the Consolidated Balance Sheets Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts Presented in the Consolidated Balance Sheets Financial Instruments Cash Collateral (1) Net Amount (dollars in thousands) Financial assets: Derivatives not designated as $ 2,177 $ (496 ) $ 1,681 $ — $ — $ 1,681 Total $ 2,177 $ (496 ) $ 1,681 $ — $ — $ 1,681 Financial liabilities: Derivatives not designated as $ 1,681 $ — $ 1,681 $ — $ — $ 1,681 Total $ 1,681 $ — $ 1,681 $ — $ — $ 1,681 (1) Represents cash collateral held with counterparty bank. December 31, 2017 Gross Amounts Not Offset in the Consolidated Gross Amounts Recognized in the Consolidated Balance Sheets Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts Presented in the Consolidated Balance Sheets Financial Instruments Cash Collateral (1) Net Amount (dollars in thousands) Financial assets: Derivatives not designated as $ 1,833 $ (698 ) $ 1,135 $ — $ — $ 1,135 Total $ 1,833 $ (698 ) $ 1,135 $ — $ — $ 1,135 Financial liabilities: Derivatives not designated as $ 1,135 $ — $ 1,135 $ — $ — $ 1,135 Total $ 1,135 $ — $ 1,135 $ — $ — $ 1,135 (1) Represents cash collateral held with counterparty bank.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Summary of Company's Revenue Streams	The following table provides a summary of the Company’s revenue streams, including those that are within the scope of ASC 606 and those that are accounted for under other applicable U.S. GAAP: For the Years ended December 31, 2018 2017 2016 Within Scope (1) Out of Scope (2) Within Scope (1) Out of Scope (2) Within Scope (1) Out of Scope (2) (dollars in thousands) Interest income: Loans $ — $ 415,410 $ — $ 251,027 $ — $ 157,935 Investment securities and other interest-earning assets — 33,013 — 18,978 — 8,670 Total interest income — 448,423 — 270,005 — 166,605 Noninterest income: Loan servicing fees — 1,445 — 787 — 1,032 Service charges on deposit accounts 5,128 — 3,273 — 1,459 — Other service fee income 902 — 1,847 — 1,516 — Debit card interchange income 4,326 — 2,043 — 267 — Earnings on bank-owned life insurance — 3,427 — 2,279 — 1,353 Net gain from sales of loans — 10,759 — 12,468 — 9,539 Net gain from sales of investment securities — 1,399 — 2,737 — 1,797 Other income 1,242 2,399 491 5,189 449 2,190 Total noninterest income 11,598 19,429 7,654 23,460 3,691 15,911 Total revenues $ 11,598 $ 467,852 $ 7,654 $ 293,465 $ 3,691 $ 182,516 ______________________________ (1) Revenues from contracts with customers accounted for under ASC 606. (2) Revenues not within the scope of ASC 606 and accounted for under other applicable U.S. GAAP requirements.

Quarterly Results of Operatio_2

Quarterly Results of Operations (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Summary of selected financial data by quarter	The following is a summary of selected financial data presented below by quarter for the periods indicated: First Quarter Second Quarter Third Quarter Fourth Quarter (dollars in thousands, except per share data) For the year ended December 31, 2018: Interest income $ 90,827 $ 92,699 $ 128,876 $ 136,021 Interest expense 9,546 11,528 16,163 18,475 Provision for credit losses 2,253 1,761 1,981 2,258 Noninterest income 7,666 8,151 8,240 6,970 Noninterest expense 49,808 50,076 82,782 67,239 Income tax provision 8,884 10,182 7,798 15,376 Net income $ 28,002 $ 27,303 $ 28,392 $ 39,643 Earnings per share: Basic $ 0.61 $ 0.59 $ 0.46 $ 0.64 Diluted 0.60 0.58 0.46 0.63 For the year ended December 31, 2017: Interest income $ 45,427 $ 68,733 $ 70,161 $ 85,684 Interest expense 3,724 5,395 5,870 7,514 Provision for credit losses 2,244 1,945 2,049 2,194 Noninterest income 4,683 8,759 8,221 9,451 Noninterest expense 30,005 48,455 39,612 49,886 Income tax provision 4,616 7,521 10,619 19,370 Net income $ 9,521 $ 14,176 $ 20,232 $ 16,171 Earnings per share: Basic $ 0.35 $ 0.36 $ 0.46 $ 0.37 Diluted 0.34 0.35 0.46 0.36

Parent Company Financial Info_2

Parent Company Financial Information (Tables) - Corporation	12 Months Ended
	Dec. 31, 2018
Parent Company Financial Information
Schedule of condensed balance sheets	Condensed financial statements of the Corporation are as follows: PACIFIC PREMIER BANCORP, INC. STATEMENTS OF FINANCIAL CONDITION (Parent company only) At December 31, 2018 2017 (dollars in thousands) Assets Cash and cash equivalents $ 13,160 $ 17,097 Investment in subsidiaries 2,068,077 1,329,961 Other assets 1,689 2,599 Total Assets $ 2,082,926 $ 1,349,657 Liabilities Subordinated debentures $ 110,313 $ 105,123 Accrued expenses and other liabilities 2,916 2,538 Total Liabilities 113,229 107,661 Total Stockholders’ Equity 1,969,697 1,241,996 Total Liabilities and Stockholders’ Equity $ 2,082,926 $ 1,349,657
Schedule of condensed statements of operations	PACIFIC PREMIER BANCORP, INC. STATEMENTS OF OPERATIONS (Parent company only) For the Years Ended December 31, 2018 2017 2016 (dollars in thousands) Income Interest income $ 57 $ 36 $ 31 Noninterest income — — — Total income 57 36 31 Expense Interest expense 6,715 4,720 3,844 Noninterest expense 6,139 8,956 3,769 Total expense 12,854 13,676 7,613 Loss before income tax provision (12,797 ) (13,640 ) (7,582 ) Income tax benefit (3,678 ) (5,417 ) (2,785 ) Net loss (parent only) (9,119 ) (8,223 ) (4,797 ) Equity in net earnings of subsidiaries 132,459 68,323 44,900 Net income $ 123,340 $ 60,100 $ 40,103
Schedule of condensed statements of cash flows	PACIFIC PREMIER BANCORP, INC. SUMMARY STATEMENTS OF CASH FLOWS (Parent company only) For the Years Ended December 31, 2018 2017 2016 CASH FLOWS FROM OPERATING ACTIVITIES (dollars in thousands) Net income $ 123,340 $ 60,100 $ 40,103 Adjustments to reconcile net income to cash used in operating activities: Share-based compensation expense 9,033 5,809 2,729 Equity in undistributed earnings of subsidiaries and dividends from the bank (132,459 ) (68,323 ) (44,901 ) Increase (decrease) in accrued expenses and other liabilities 6,464 (365 ) 240 (Decrease) increase in current and deferred taxes (3,682 ) (896 ) — Decrease (increase) in other assets (6,888 ) 1,714 4,794 Net cash (used in) provided by operating activities (4,192 ) (1,961 ) 2,965 CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from issuance of common stock, net of issuance cost — — — Repurchase of common stock (1,669 ) (1,258 ) (125 ) Proceeds from exercise of options and warrants 1,924 4,592 1,107 Capital contribution to Bank — 600 7,765 Proceeds from issuance of subordinated debentures — — — Net cash provided by (used in) financing activities 255 3,934 8,747 Net increase (decrease) in cash and cash equivalents (3,937 ) 1,973 11,712 Cash and cash equivalents, beginning of year 17,097 15,124 3,412 Cash and cash equivalents, end of year $ 13,160 $ 17,097 $ 15,124

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Schedule of assets acquired and liabilities assumed and the provisional fair value adjustments and amounts recorded	The following table represents the HEOP assets acquired and liabilities assumed as of April 1, 2017 and the fair value adjustments and amounts recorded by the Company under the acquisition method of accounting: HEOP Book Value Fair Value Adjustments Fair Value ASSETS ACQUIRED (dollars in thousands) Cash and cash equivalents $ 78,728 $ — $ 78,728 Investment securities 445,299 (2,376 ) 442,923 Loans, gross 1,384,949 (20,261 ) 1,364,688 Allowance for loan losses (17,200 ) 17,200 — Fixed assets 35,567 (665 ) 34,902 Core deposit intangible 3,207 24,916 28,123 Deferred tax assets 17,850 (7,606 ) 10,244 Other assets 55,235 (21 ) 55,214 Total assets acquired $ 2,003,635 $ 11,187 $ 2,014,822 LIABILITIES ASSUMED Deposits $ 1,668,085 $ 1,465 $ 1,669,550 Borrowings 139,150 (116 ) 139,034 Other Liabilities 8,059 293 8,352 Total liabilities assumed 1,815,294 1,642 1,816,936 Excess of assets acquired over liabilities assumed $ 188,341 $ 9,545 197,886 Consideration paid 467,439 Goodwill recognized $ 269,553 The following table represents the SCAF assets acquired and liabilities assumed as of January 31, 2016 and the fair value adjustments and amounts recorded by the Company under the acquisition method of accounting: SCAF Book Value Fair Value Adjustments Fair Value (dollars in thousands) ASSETS ACQUIRED Cash and cash equivalents $ 40,947 $ — $ 40,947 Interest-bearing deposits with financial institutions 1,972 — 1,972 Investment securities 191,881 (1,627 ) 190,254 Loans, gross 467,197 (11,039 ) 456,158 Allowance for loan losses (7,399 ) 7,399 — Fixed assets 5,335 (1,145 ) 4,190 Core deposit intangible 493 3,826 4,319 Deferred tax assets 5,618 1,130 6,748 Other assets 10,589 (1,227 ) 9,362 Total assets acquired $ 716,633 $ (2,683 ) $ 713,950 LIABILITIES ASSUMED Deposits $ 636,450 $ 141 $ 636,591 Borrowings — — — Deferred tax liability — — — Other Liabilities 9,063 (220 ) 8,843 Total liabilities assumed 645,513 (79 ) 645,434 Excess of assets acquired over liabilities assumed $ 71,120 $ (2,604 ) 68,516 Consideration paid 120,174 Goodwill recognized $ 51,658 The following table represents the Grandpoint assets acquired and liabilities assumed as of July 1, 2018 and the fair value adjustments and amounts recorded by the Company under the acquisition method of accounting: Grandpoint Fair Value Fair Book Value Adjustment Value (dollars in thousands) ASSETS ACQUIRED Cash and cash equivalents $ 147,551 $ — $ 147,551 Investment securities 395,905 (3,047 ) 392,858 Loans, gross 2,404,042 (51,325 ) 2,352,717 Allowance for loan losses (18,665 ) 18,665 — Fixed assets 6,015 3,107 9,122 Core deposit intangible 5,093 66,850 71,943 Deferred tax assets 14,185 (9,802 ) 4,383 Other assets 97,441 (195 ) 97,246 Total assets acquired $ 3,051,567 $ 24,253 $ 3,075,820 LIABILITIES ASSUMED Deposits $ 2,506,663 $ 266 $ 2,506,929 Borrowings 255,155 (232 ) 254,923 Other Liabilities 23,687 1,172 24,859 Total liabilities assumed 2,785,505 1,206 2,786,711 Excess of assets acquired over liabilities assumed $ 266,062 $ 23,047 289,109 Consideration paid 602,152 Goodwill recognized $ 313,043 The following table represents the PLZZ assets acquired and liabilities assumed as of November 1, 2017 and the fair value adjustments and amounts recorded by the Company under the acquisition method of accounting: PLZZ Fair Value Fair Book Value Adjustment Value (dollars in thousands) ASSETS ACQUIRED Cash and cash equivalents $ 150,459 $ — $ 150,459 Loans, gross 1,069,359 (6,458 ) 1,062,901 Allowance for loan losses (13,009 ) 13,009 — Fixed assets 7,389 (1,424 ) 5,965 Core deposit intangible 198 10,575 10,773 Deferred tax assets 11,849 (6,123 ) 5,726 Other assets 19,495 (589 ) 18,906 Total assets acquired $ 1,245,740 $ 8,990 $ 1,254,730 LIABILITIES ASSUMED Deposits $ 1,081,727 $ 1,224 $ 1,082,951 Borrowings 40,755 397 41,152 Other Liabilities 8,956 (450 ) 8,506 Total liabilities assumed 1,131,438 1,171 1,132,609 Excess of assets acquired over liabilities assumed $ 114,302 $ 7,819 122,121 Consideration paid 245,761 Goodwill recognized $ 123,640
Schedule of contractual amounts due, expected cash flows to be collected, interest component and fair value as of the respective acquisition dates	For loans acquired from Grandpoint, PLZZ, HEOP and SCAF, the contractual amounts due, expected cash flows to be collected, interest component and fair value as of the respective acquisition dates were as follows: Acquired Loans Grandpoint PLZZ HEOP SCAF (dollars in thousands) Contractual amounts due $ 3,496,905 $ 1,708,685 $ 1,717,230 $ 539,806 Cash flows not expected to be collected 39,071 20,152 4,442 2,765 Expected cash flows 3,457,834 1,688,533 1,712,788 537,041 Interest component of expected cash flows 1,105,117 625,632 348,100 80,883 Fair value of acquired loans $ 2,352,717 $ 1,062,901 $ 1,364,688 $ 456,158
Summary of pro forma net interest and other income, net income and earnings per share	naudited pro forma net interest and other income, net income and earnings per share presented below: Year Ended December 31, 2018 2017 2016 Net interest and other income $ 473,748 $ 465,400 $ 378,894 Net income 133,565 96,758 104,908 Basic earnings per share 2.16 1.58 1.71 Diluted earnings per share 2.14 1.56 1.70

Description of Business and S_3

Description of Business and Summary of Significant Accounting Policies (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)depository_branch	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Mar. 31, 2019USD ($)
Accounting Policies [Abstract]
Percentage of capital stock of the Bank held			100.00%
Number of depository branches | depository_branch			44
Cash and Cash Equivalents
Cash reserves required by the Board of Governors of the Federal Reserve for depository institutions (in dollars)			$ 0
Premises, furniture and equipment
Valuation allowance			0	$ 380,000	$ 0
Excess tax benefit of stock-based compensation			(1,811,000)	$ (1,995,000)	$ 0
Reclassification of certain tax effects of the Tax Cuts and Jobs Act			0
Accumulated Other Comprehensive Income (Loss)
Premises, furniture and equipment
Reclassification of certain tax effects of the Tax Cuts and Jobs Act			82,000
Accumulated Retained Earnings
Premises, furniture and equipment
Reclassification of certain tax effects of the Tax Cuts and Jobs Act			$ (82,000)
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Income (Loss)
Premises, furniture and equipment
Reclassification of certain tax effects of the Tax Cuts and Jobs Act	$ 82,000
Accounting Standards Update 2018-02 | Accumulated Retained Earnings
Premises, furniture and equipment
Reclassification of certain tax effects of the Tax Cuts and Jobs Act		$ (82,000)
Accounting Standards Update 2016-02 | Scenario, Forecast
Premises, furniture and equipment
Liability for future lease payments						$ 43,000,000
Right of use assets						$ 41,000,000
Core Deposits | Minimum
Premises, furniture and equipment
Weighted average useful life (in years)			6 years
Core Deposits | Maximum
Premises, furniture and equipment
Weighted average useful life (in years)			11 years 6 months
Premises
Premises, furniture and equipment
Estimated useful life (in years)			40 years
Furniture, fixtures and equipment
Premises, furniture and equipment
Estimated useful life (in years)			7 years
Computer and telecommunication
Premises, furniture and equipment
Estimated useful life (in years)			3 years

Regulatory Capital Requiremen_3

Regulatory Capital Requirements and Other Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Tier 1 Leverage Ratio
Actual, Amount (in dollars)	$ 1,112,132	$ 737,173
Actual, Ratio (as a percent)	10.38%	10.61%
Minimum Required for Capital Adequacy Purposes Amount (in dollars)	$ 428,751	$ 277,900
Minimum Required for Capital Adequacy Purposes Ratio (as a percent)	4.00%	4.00%
Common Equity Tier 1 to Risk-Weighted Assets
Actual, Amount (in dollars)	$ 1,087,164	$ 717,145
Actual, Ratio (as a percent)	10.88%	10.48%
Minimum Required for Capital Adequacy Purposes (in dollars)	$ 449,505	$ 307,818
Minimum Required for Capital Adequacy Purposes (as a percent)	4.50%	4.50%
Tier 1 Capital to Risk-Weighted Assets
Actual, Amount (in dollars)	$ 1,112,132	$ 737,173
Actual, Ratio (as a percent)	11.13%	10.78%
Minimum Required for Capital Adequacy Purposes Amount (in dollars)	$ 599,340	$ 410,424
Minimum Required for Capital Adequacy Purposes Ratio (as a percent)	6.00%	6.00%
Total Capital to Risk-Weighted Assets
Actual, Amount (in dollars)	$ 1,237,315	$ 852,382
Actual, Ratio (as a percent)	12.39%	12.46%
Minimum Required for Capital Adequacy Purposes Amount (in dollars)	$ 799,120	$ 547,232
Minimum Required for Capital Adequacy Purposes Ratio (as a percent)	8.00%	8.00%
Pacific Premier Bank
Tier 1 Leverage Ratio
Actual, Amount (in dollars)	$ 1,185,544	$ 805,110
Actual, Ratio (as a percent)	11.06%	11.59%
Minimum Required for Capital Adequacy Purposes Amount (in dollars)	$ 428,703	$ 277,870
Minimum Required for Capital Adequacy Purposes Ratio (as a percent)	4.00%	4.00%
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Amount (in dollars)	$ 535,879	$ 347,337
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Ratio (as a percent)	5.00%	5.00%
Common Equity Tier 1 to Risk-Weighted Assets
Actual, Amount (in dollars)	$ 1,185,544	$ 805,110
Actual, Ratio (as a percent)	11.87%	11.77%
Minimum Required for Capital Adequacy Purposes (in dollars)	$ 449,481	$ 307,742
Minimum Required for Capital Adequacy Purposes (as a percent)	4.50%	4.50%
Required to be Well Capitalized Under Prompt Corrective Action Regulations (in dollars)	$ 649,251	$ 444,516
Required to be Well Capitalized Under Prompt Corrective Action Regulations (as a percent)	6.50%	6.50%
Tier 1 Capital to Risk-Weighted Assets
Actual, Amount (in dollars)	$ 1,185,544	$ 805,110
Actual, Ratio (as a percent)	11.87%	11.77%
Minimum Required for Capital Adequacy Purposes Amount (in dollars)	$ 599,308	$ 410,322
Minimum Required for Capital Adequacy Purposes Ratio (as a percent)	6.00%	6.00%
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Amount (in dollars)	$ 799,078	$ 547,096
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Ratio (as a percent)	8.00%	8.00%
Total Capital to Risk-Weighted Assets
Actual, Amount (in dollars)	$ 1,226,258	$ 835,945
Actual, Ratio (as a percent)	12.28%	12.22%
Minimum Required for Capital Adequacy Purposes Amount (in dollars)	$ 799,078	$ 547,096
Minimum Required for Capital Adequacy Purposes Ratio (as a percent)	8.00%	8.00%
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Amount (in dollars)	$ 998,847	$ 683,870
Required to be Well Capitalized Under Prompt Corrective Action Regulations, Ratio (as a percent)	10.00%	10.00%

Investment Securities - The amo

Investment Securities - The amortized cost and estimated fair value of securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment securities available-for-sale:
Amortized Cost	$ 1,111,168	$ 786,783
Unrealized Gain	6,263	6,161
Unrealized Loss	(14,209)	(5,515)
Estimated Fair Value	1,103,222	787,429
Investment securities held-to-maturity:
Amortized Cost	45,210	18,291
Unrealized Gain	148	0
Unrealized Loss	(686)	(209)
Estimated Fair Value	44,672	18,082
Total investment securities
Amortized Cost	1,156,378	805,074
Unrealized Gain	6,411	6,161
Unrealized Loss	(14,895)	(5,724)
Estimated Fair Value	1,147,894	805,511
Additional disclosures
Accumulated other comprehensive income (loss)	(7,900)	646
Accumulated other comprehensive income (loss), net of tax	(5,601)	415
Fair value of securities pledged as collateral for the Bank's inverse putable reverse repurchases		27,300
Average balance of repurchase agreement facilities	15,000
OTTI realized			$ 205
Gross gains	1,600	3,100	1,800
Gross losses	(208)	(386)	(9)
Net proceeds from the sale of available-for-sale securities	407,004	268,596	$ 230,945
Home Owners Association Loans
Additional disclosures
Value of inverse putable reverse repurchases secured by collateral	75
U.S. Treasury
Investment securities available-for-sale:
Amortized Cost	59,688
Unrealized Gain	1,224
Unrealized Loss	0
Estimated Fair Value	60,912
Agency
Investment securities available-for-sale:
Amortized Cost	128,958	47,051
Unrealized Gain	1,631	236
Unrealized Loss	(519)	(78)
Estimated Fair Value	130,070	47,209
Corporate debt
Investment securities available-for-sale:
Amortized Cost	104,158	78,155
Unrealized Gain	291	1,585
Unrealized Loss	(906)	(194)
Estimated Fair Value	103,543	79,546
Municipal bonds
Investment securities available-for-sale:
Amortized Cost	238,914	228,929
Unrealized Gain	1,941	3,942
Unrealized Loss	(2,225)	(743)
Estimated Fair Value	238,630	232,128
Collateralized mortgage obligation: residential
Investment securities available-for-sale:
Amortized Cost	24,699	33,984
Unrealized Gain	64	132
Unrealized Loss	(425)	(335)
Estimated Fair Value	24,338	33,781
Mortgage-backed securities: residential
Investment securities available-for-sale:
Amortized Cost	554,751	398,664
Unrealized Gain	1,112	266
Unrealized Loss	(10,134)	(4,165)
Estimated Fair Value	545,729	394,765
Investment securities held-to-maturity:
Amortized Cost	43,381	17,153
Unrealized Gain	148	0
Unrealized Loss	(686)	(209)
Estimated Fair Value	42,843	16,944
Additional disclosures
Estimated par value of securities pledged as collateral for the Bank's inverse putable reverse repurchases	20,300
Fair value of securities pledged as collateral for the Bank's inverse putable reverse repurchases	20,900
Other
Investment securities held-to-maturity:
Amortized Cost	1,829	1,138
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	$ 1,829	$ 1,138

Investment Securities - Number,

Investment Securities - Number, fair value and gross unrealized holding losses (Details) $ in Thousands	Dec. 31, 2018USD ($)investment_security	Dec. 31, 2017USD ($)investment_security
Number
Less than 12 months | investment_security	105	184
12 months or Longer | investment_security	244	76
Total | investment_security	349	260
Fair Value
Less than 12 months	$ 190,770	$ 320,068
12 months or Longer	442,464	140,739
Total	633,234	460,807
Gross Unrealized Holding Losses
Less than 12 months	(1,609)	(2,159)
12 months or Longer	(12,600)	(3,356)
Total	$ (14,209)	$ (5,515)
Number
Less than 12 months | investment_security	3	2
12 months or Longer | investment_security	3	1
Total | investment_security	6	3
Fair Value
Less than 12 months	$ 11,256	$ 10,745
12 months or Longer	15,741	6,198
Total	26,997	16,943
Gross Unrealized Holding Losses
Less than 12 months	(81)	(133)
12 months or Longer	(605)	(76)
Total	$ (686)	$ (209)
Total investment securities
Number, Less than 12 months (in investments) | investment_security	108	186
Number, 12 months or Longer (in investments) | investment_security	247	77
Number, Total (in investments) | investment_security	355	263
Fair Value, Less than 12 months	$ 202,026	$ 330,813
Fair Value, 12 months or Longer	458,205	146,937
Fair Value, Total	660,231	477,750
Gross Unrealized Holding Losses, Less than 12 months	(1,690)	(2,292)
Gross Unrealized Holding Losses, 12 months or longer	(13,205)	(3,432)
Gross Unrealized Holding Losses, Total	$ (14,895)	$ (5,724)
Agency
Number
Less than 12 months | investment_security	15	6
12 months or Longer | investment_security	6	0
Total | investment_security	21	6
Fair Value
Less than 12 months	$ 26,229	$ 13,754
12 months or Longer	10,434	0
Total	36,663	13,754
Gross Unrealized Holding Losses
Less than 12 months	(333)	(78)
12 months or Longer	(186)	0
Total	$ (519)	$ (78)
Corporate debt
Number
Less than 12 months | investment_security	9	4
12 months or Longer | investment_security	8	2
Total | investment_security	17	6
Fair Value
Less than 12 months	$ 47,805	$ 10,079
12 months or Longer	19,369	6,076
Total	67,174	16,155
Gross Unrealized Holding Losses
Less than 12 months	(471)	(64)
12 months or Longer	(435)	(130)
Total	$ (906)	$ (194)
Municipal bonds
Number
Less than 12 months | investment_security	60	103
12 months or Longer | investment_security	102	30
Total | investment_security	162	133
Fair Value
Less than 12 months	$ 45,083	$ 61,313
12 months or Longer	69,693	15,658
Total	114,776	76,971
Gross Unrealized Holding Losses
Less than 12 months	(369)	(268)
12 months or Longer	(1,856)	(475)
Total	$ (2,225)	$ (743)
Collateralized mortgage obligation: residential
Number
Less than 12 months | investment_security	1	5
12 months or Longer | investment_security	8	3
Total | investment_security	9	8
Fair Value
Less than 12 months	$ 814	$ 13,971
12 months or Longer	18,104	8,943
Total	18,918	22,914
Gross Unrealized Holding Losses
Less than 12 months	(1)	(149)
12 months or Longer	(424)	(186)
Total	$ (425)	$ (335)
Mortgage-backed securities: residential
Number
Less than 12 months | investment_security	20	66
12 months or Longer | investment_security	120	41
Total | investment_security	140	107
Fair Value
Less than 12 months	$ 70,839	$ 220,951
12 months or Longer	324,864	110,062
Total	395,703	331,013
Gross Unrealized Holding Losses
Less than 12 months	(435)	(1,600)
12 months or Longer	(9,699)	(2,565)
Total	$ (10,134)	$ (4,165)
Number
Less than 12 months | investment_security	3	2
12 months or Longer | investment_security	3	1
Total | investment_security	6	3
Fair Value
Less than 12 months	$ 11,256	$ 10,745
12 months or Longer	15,741	6,198
Total	26,997	16,943
Gross Unrealized Holding Losses
Less than 12 months	(81)	(133)
12 months or Longer	(605)	(76)
Total	$ (686)	$ (209)
Other
Number
Less than 12 months | investment_security	0	0
12 months or Longer | investment_security	0	0
Total | investment_security	0	0
Fair Value
Less than 12 months	$ 0	$ 0
12 months or Longer	0	0
Total	0	0
Gross Unrealized Holding Losses
Less than 12 months	0	0
12 months or Longer	0	0
Total	$ 0	$ 0

Investment Securities - Contrac

Investment Securities - Contractual maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortized Cost
One Year or Less	$ 6,263
More than One Year to Five Years	76,794
More than Five Years to Ten Years	461,612
More than Ten Years	566,499
Amortized Cost	1,111,168	$ 786,783
Fair Value
One Year or Less	6,255
More than One Year to Five Years	77,606
More than Five Years to Ten Years	461,134
More than Ten Years	558,227
Total	1,103,222	787,429
Amortized Cost
One Year or Less	0
More than One Year to Five Years	928
More than Five Years to Ten Years	0
More than Ten Years	44,282
Amortized Cost	45,210	18,291
Fair Value
One Year or Less	0
More than One Year to Five Years	942
More than Five Years to Ten Years	0
More than Ten Years	43,730
Total	44,672	18,082
Amortized Cost
One Year or Less	6,263
More than One Year to Five Years	77,722
More than Five Years to Ten Years	461,612
More than Ten Years	610,781
Total	1,156,378
Fair Value
One Year or Less	6,255
More than One Year to Five Years	78,548
More than Five Years to Ten Years	461,134
More than Ten Years	601,957
Estimated Fair Value	1,147,894	805,511
U.S. Treasury
Amortized Cost
One Year or Less	0
More than One Year to Five Years	10,407
More than Five Years to Ten Years	49,281
More than Ten Years	0
Amortized Cost	59,688
Fair Value
One Year or Less	0
More than One Year to Five Years	10,606
More than Five Years to Ten Years	50,306
More than Ten Years	0
Total	60,912
Agency
Amortized Cost
One Year or Less	992
More than One Year to Five Years	35,103
More than Five Years to Ten Years	74,149
More than Ten Years	18,714
Amortized Cost	128,958	47,051
Fair Value
One Year or Less	991
More than One Year to Five Years	35,769
More than Five Years to Ten Years	74,926
More than Ten Years	18,384
Total	130,070	47,209
Corporate debt
Amortized Cost
One Year or Less	0
More than One Year to Five Years	0
More than Five Years to Ten Years	104,158
More than Ten Years	0
Amortized Cost	104,158	78,155
Fair Value
One Year or Less	0
More than One Year to Five Years	0
More than Five Years to Ten Years	103,543
More than Ten Years	0
Total	103,543	79,546
Municipal bonds
Amortized Cost
One Year or Less	5,271
More than One Year to Five Years	29,715
More than Five Years to Ten Years	70,354
More than Ten Years	133,574
Amortized Cost	238,914	228,929
Fair Value
One Year or Less	5,264
More than One Year to Five Years	29,704
More than Five Years to Ten Years	69,581
More than Ten Years	134,081
Total	238,630	232,128
Collateralized mortgage obligation: residential
Amortized Cost
One Year or Less	0
More than One Year to Five Years	0
More than Five Years to Ten Years	815
More than Ten Years	23,884
Amortized Cost	24,699	33,984
Fair Value
One Year or Less	0
More than One Year to Five Years	0
More than Five Years to Ten Years	814
More than Ten Years	23,524
Total	24,338	33,781
Mortgage-backed securities: residential
Amortized Cost
One Year or Less	0
More than One Year to Five Years	1,569
More than Five Years to Ten Years	162,855
More than Ten Years	390,327
Amortized Cost	554,751	398,664
Fair Value
One Year or Less	0
More than One Year to Five Years	1,527
More than Five Years to Ten Years	161,964
More than Ten Years	382,238
Total	545,729	394,765
Amortized Cost
One Year or Less	0
More than One Year to Five Years	928
More than Five Years to Ten Years	0
More than Ten Years	42,453
Amortized Cost	43,381	17,153
Fair Value
One Year or Less	0
More than One Year to Five Years	942
More than Five Years to Ten Years	0
More than Ten Years	41,901
Total	42,843	$ 16,944
Other
Amortized Cost
One Year or Less	0
More than One Year to Five Years	0
More than Five Years to Ten Years	0
More than Ten Years	1,829
Amortized Cost	1,829
Fair Value
One Year or Less	0
More than One Year to Five Years	0
More than Five Years to Ten Years	0
More than Ten Years	1,829
Total	$ 1,829

Investment Securities - FHLB, F

Investment Securities - FHLB, FRB, and other stock (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
FHLB stock	$ 19.6
Federal Reserve Bank Stock	51.5
Other stock	37.7
FHLB repurchases	$ 24.9	$ 10.3

Loans - Composition of Loan Por

Loans - Composition of Loan Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loans Held for Investment
Gross loans held for investment	$ 8,846,286	$ 6,198,627
Deferred loan origination fees and discounts, net	(9,468)	(2,403)
Loans held for investment	8,836,818	6,196,224
Allowance for loan losses	(36,072)	(28,936)	$ (21,296)	$ (17,317)
Loans held for investment, net	8,800,746	6,167,288
Less loans held for sale, net	5,719	23,426
Servicing rights retained from guaranteed portion of SBA loans sold	8,500	8,800
Unpaid principal balance for loans and participations serviced for others	635,300	634,500
Business Loans
Loans Held for Investment
Gross loans held for investment	4,141,362	3,337,866
Business Loans | Commercial and industrial
Loans Held for Investment
Gross loans held for investment	1,364,423	1,086,659
Allowance for loan losses	(10,821)	(9,721)	(6,362)	(3,449)
Business Loans | Franchise
Loans Held for Investment
Gross loans held for investment	765,416	660,414
Allowance for loan losses	(6,500)	(5,797)	(3,845)	(3,124)
Business Loans | Commercial owner occupied
Loans Held for Investment
Gross loans held for investment	1,679,122	1,289,213
Allowance for loan losses	(1,386)	(767)	(1,193)	(1,870)
Business Loans | SBA
Loans Held for Investment
Gross loans held for investment	193,882	185,514
Allowance for loan losses	(4,288)	(2,890)	(1,039)	(1,500)
Business Loans | Agribusiness
Loans Held for Investment
Gross loans held for investment	138,519	116,066
Allowance for loan losses	(3,283)	(1,291)	0	0
Real Estate Loans
Loans Held for Investment
Gross loans held for investment	4,615,500	2,767,830
Real Estate Loans | Commercial non-owner occupied
Loans Held for Investment
Gross loans held for investment	2,003,174	1,243,115
Allowance for loan losses	(1,604)	(1,266)	(1,715)	(2,048)
Real Estate Loans | Multi-family
Loans Held for Investment
Gross loans held for investment	1,535,289	794,384
Allowance for loan losses	(725)	(607)	(2,927)	(1,583)
Real Estate Loans | One-to-four family
Loans Held for Investment
Gross loans held for investment	356,264	270,894
Allowance for loan losses	(805)	(803)	(365)	(698)
Real Estate Loans | Construction
Loans Held for Investment
Gross loans held for investment	523,643	282,811
Allowance for loan losses	(5,166)	(4,569)	(3,632)	(2,030)
Real Estate Loans | Farmland
Loans Held for Investment
Gross loans held for investment	150,502	145,393
Allowance for loan losses	(503)	(137)	0	0
Real Estate Loans | Land
Loans Held for Investment
Gross loans held for investment	46,628	31,233
Allowance for loan losses	(772)	(993)	(198)	(233)
Consumer Loans | Consumer loans
Loans Held for Investment
Gross loans held for investment	89,424	92,931
Allowance for loan losses	$ (219)	$ (95)	$ (20)	$ (23)

Loans - Purchased Credit Impair

Loans - Purchased Credit Impaired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans Held for Investment
Total purchase credit impaired	$ 17,440
SBA
Loans Held for Investment
Total purchase credit impaired			$ 3,865
Business Loans | Commercial and industrial
Loans Held for Investment
Total purchase credit impaired	1,071	$ 1,585	1,990
Business Loans | Commercial owner occupied
Loans Held for Investment
Total purchase credit impaired	628	98	847
Business Loans | SBA
Loans Held for Investment
Total purchase credit impaired	7,598	4,329
Real Estate Loans
Loans Held for Investment
Total purchase credit impaired		6,896	7,029
Real Estate Loans | Commercial non-owner occupied
Loans Held for Investment
Total purchase credit impaired	0	0	0
Real Estate Loans | One-to-four family
Loans Held for Investment
Total purchase credit impaired	453	849	291
Real Estate Loans | Construction
Loans Held for Investment
Total purchase credit impaired		0
Real Estate Loans | Land
Loans Held for Investment
Total purchase credit impaired	0	35	$ 36
Consumer Loans | Consumer loans
Loans Held for Investment
Total purchase credit impaired	0
Acquired Banks
Loans Held for Investment
Total purchase credit impaired	2,182	8,889
Acquired Banks | Business Loans
Loans Held for Investment
Total purchase credit impaired	1,907	6,374
Acquired Banks | Business Loans | Commercial and industrial
Loans Held for Investment
Total purchase credit impaired	10	3,310
Acquired Banks | Business Loans | Commercial owner occupied
Loans Held for Investment
Total purchase credit impaired	632	1,262
Acquired Banks | Business Loans | SBA
Loans Held for Investment
Total purchase credit impaired	1,265	1,802
Acquired Banks | Real Estate Loans
Loans Held for Investment
Total purchase credit impaired	275	2,505
Acquired Banks | Real Estate Loans | Commercial non-owner occupied
Loans Held for Investment
Total purchase credit impaired	275	1,650
Acquired Banks | Real Estate Loans | One-to-four family
Loans Held for Investment
Total purchase credit impaired	0	255
Acquired Banks | Real Estate Loans | Construction
Loans Held for Investment
Total purchase credit impaired	0	517
Acquired Banks | Real Estate Loans | Land
Loans Held for Investment
Total purchase credit impaired	0	83
Acquired Banks | Consumer Loans | Consumer loans
Loans Held for Investment
Total purchase credit impaired	$ 0	$ 10

Loans - Accretable yield on the

Loans - Accretable yield on the purchased credit impaired (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accretable yield on purchased credit impaired
Balance at the beginning of period	$ 3,019	$ 3,747	$ 2,726
Additions	1,430	3,102	788
Accretion	(532)	(2,037)	(1,354)
Payoffs	(1,688)	(2,125)	165
Sales	(1,818)	0	0
Reclassification from nonaccretable difference	0	332	1,422
Balance at the end of period	$ 411	$ 3,019	$ 3,747

Loans - Investment in impaired

Loans - Investment in impaired loans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Impaired Loans
Recorded Investment	$ 12,458,000
Unpaid Principal Balance	17,440,000
With Specific Allowance	1,038,000
Without Specific Allowance	11,420,000
Specific Allowance for Impaired Loans	584,000
Average Recorded Investment	7,562,000
Interest Income Recognized	36,000
Investment in TDR	0	$ 97,000
Nonaccruing loans	4,900,000	3,300,000	$ 1,100,000
Loans 90 days or more past due and still accruing	213,000	1,800,000
Franchise
Impaired Loans
Recorded Investment	189,000
Unpaid Principal Balance	190,000
With Specific Allowance	0
Without Specific Allowance	189,000
Specific Allowance for Impaired Loans	0
Average Recorded Investment	119,000
Interest Income Recognized	0
SBA
Impaired Loans
Recorded Investment			316,000
Unpaid Principal Balance			3,865,000
With Specific Allowance			0
Without Specific Allowance			316,000
Specific Allowance for Impaired Loans			0
Average Recorded Investment			331,000
Interest Income Recognized			23,000
Business Loans | Commercial and industrial
Impaired Loans
Recorded Investment	1,023,000	1,160,000	250,000
Unpaid Principal Balance	1,071,000	1,585,000	1,990,000
With Specific Allowance	550,000	0	250,000
Without Specific Allowance	473,000	1,160,000	0
Specific Allowance for Impaired Loans	118,000	0	250,000
Average Recorded Investment	1,173,000	441,000	864,000
Interest Income Recognized	1,000	0	76,000
Business Loans | Franchise
Impaired Loans
Recorded Investment			0
Unpaid Principal Balance			0
With Specific Allowance			0
Without Specific Allowance			0
Specific Allowance for Impaired Loans			0
Average Recorded Investment			1,016,000
Interest Income Recognized			68,000
Business Loans | Commercial owner occupied
Impaired Loans
Recorded Investment	599,000	97,000	436,000
Unpaid Principal Balance	628,000	98,000	847,000
With Specific Allowance	0	97,000	0
Without Specific Allowance	599,000	0	436,000
Specific Allowance for Impaired Loans	0	55,000	0
Average Recorded Investment	1,549,000	153,000	505,000
Interest Income Recognized	0	0	37,000
Business Loans | SBA
Impaired Loans
Recorded Investment	2,739,000	1,201,000
Unpaid Principal Balance	7,598,000	4,329,000
With Specific Allowance	488,000	0
Without Specific Allowance	2,251,000	1,201,000
Specific Allowance for Impaired Loans	466,000	0
Average Recorded Investment	1,814,000	434,000
Interest Income Recognized	0	0
Business Loans | Agribusiness
Impaired Loans
Recorded Investment	7,500,000
Unpaid Principal Balance	7,500,000
With Specific Allowance	0
Without Specific Allowance	7,500,000
Specific Allowance for Impaired Loans	0
Average Recorded Investment	625,000
Interest Income Recognized	35,000
Real Estate Loans
Impaired Loans
Recorded Investment		3,284,000	1,141,000
Unpaid Principal Balance		6,896,000	7,029,000
With Specific Allowance		97,000	250,000
Without Specific Allowance		3,187,000	891,000
Specific Allowance for Impaired Loans		55,000	250,000
Average Recorded Investment		2,309,000	4,032,000
Interest Income Recognized		0	317,000
Real Estate Loans | Commercial non-owner occupied
Impaired Loans
Recorded Investment	0	0	0
Unpaid Principal Balance	0	0	0
With Specific Allowance	0	0	0
Without Specific Allowance	0	0	0
Specific Allowance for Impaired Loans	0	0	0
Average Recorded Investment	538,000	86,000	1,072,000
Interest Income Recognized	0	0	93,000
Real Estate Loans | Multi-family
Impaired Loans
Recorded Investment	0
Unpaid Principal Balance	0
With Specific Allowance	0
Without Specific Allowance	0
Specific Allowance for Impaired Loans	0
Average Recorded Investment	500,000
Interest Income Recognized	0
Real Estate Loans | One-to-four family
Impaired Loans
Recorded Investment	408,000	817,000	124,000
Unpaid Principal Balance	453,000	849,000	291,000
With Specific Allowance	0	0	0
Without Specific Allowance	408,000	817,000	124,000
Specific Allowance for Impaired Loans	0	0	0
Average Recorded Investment	1,206,000	166,000	226,000
Interest Income Recognized	0	0	18,000
Real Estate Loans | Construction
Impaired Loans
Recorded Investment		0
Unpaid Principal Balance		0
With Specific Allowance		0
Without Specific Allowance		0
Specific Allowance for Impaired Loans		0
Average Recorded Investment		1,017,000
Interest Income Recognized		0
Real Estate Loans | Land
Impaired Loans
Recorded Investment	0	9,000	15,000
Unpaid Principal Balance	0	35,000	36,000
With Specific Allowance	0	0	0
Without Specific Allowance	0	9,000	15,000
Specific Allowance for Impaired Loans	0	0	0
Average Recorded Investment	5,000	12,000	18,000
Interest Income Recognized	0	$ 0	$ 2,000
Consumer Loans | Consumer loans
Impaired Loans
Recorded Investment	0
Unpaid Principal Balance	0
With Specific Allowance	0
Without Specific Allowance	0
Specific Allowance for Impaired Loans	0
Average Recorded Investment	33,000
Interest Income Recognized	$ 0

Loans - Internal risk grading s

Loans - Internal risk grading system (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)areagrade	Dec. 31, 2017USD ($)
Receivables [Abstract]
Number of areas where the entity's credit quality is maintained and credit risk managed | area	2
Number of Pass scale grades | grade	6
Credit Risk Grades
Gross loans	$ 8,852,005	$ 6,222,053
Warehouse Facilities
Credit Risk Grades
Gross loans		116,066
Pass
Credit Risk Grades
Gross loans	8,764,593	6,160,136
Pass | Warehouse Facilities
Credit Risk Grades
Gross loans		108,143
Special Mention
Credit Risk Grades
Gross loans	25,956	13,612
Special Mention | Warehouse Facilities
Credit Risk Grades
Gross loans		4,079
Substandard
Credit Risk Grades
Gross loans	61,456	48,305
Substandard | Warehouse Facilities
Credit Risk Grades
Gross loans		3,844
Doubtful
Credit Risk Grades
Gross loans	0	0
Doubtful | Warehouse Facilities
Credit Risk Grades
Gross loans		0
Business Loans | Commercial and industrial
Credit Risk Grades
Gross loans	1,364,461	1,086,659
Business Loans | Franchise
Credit Risk Grades
Gross loans	765,416	660,415
Business Loans | Commercial owner occupied
Credit Risk Grades
Gross loans	1,679,122	1,295,214
Business Loans | SBA
Credit Risk Grades
Gross loans	198,201	202,938
Business Loans | Warehouse Facilities
Credit Risk Grades
Gross loans		116,066
Business Loans | Agribusiness
Credit Risk Grades
Gross loans	138,519
Business Loans | Pass | Commercial and industrial
Credit Risk Grades
Gross loans	1,340,322	1,063,452
Business Loans | Pass | Franchise
Credit Risk Grades
Gross loans	760,795	660,415
Business Loans | Pass | Commercial owner occupied
Credit Risk Grades
Gross loans	1,660,994	1,273,380
Business Loans | Pass | SBA
Credit Risk Grades
Gross loans	189,006	199,468
Business Loans | Pass | Agribusiness
Credit Risk Grades
Gross loans	125,355
Business Loans | Special Mention | Commercial and industrial
Credit Risk Grades
Gross loans	12,005	8,163
Business Loans | Special Mention | Franchise
Credit Risk Grades
Gross loans	4,431	0
Business Loans | Special Mention | Commercial owner occupied
Credit Risk Grades
Gross loans	1,580	654
Business Loans | Special Mention | SBA
Credit Risk Grades
Gross loans	2,289	1
Business Loans | Special Mention | Agribusiness
Credit Risk Grades
Gross loans	0
Business Loans | Substandard | Commercial and industrial
Credit Risk Grades
Gross loans	12,134	15,044
Business Loans | Substandard | Franchise
Credit Risk Grades
Gross loans	190	0
Business Loans | Substandard | Commercial owner occupied
Credit Risk Grades
Gross loans	16,548	21,180
Business Loans | Substandard | SBA
Credit Risk Grades
Gross loans	6,906	3,469
Business Loans | Substandard | Agribusiness
Credit Risk Grades
Gross loans	13,164
Business Loans | Doubtful | Commercial and industrial
Credit Risk Grades
Gross loans	0	0
Business Loans | Doubtful | Franchise
Credit Risk Grades
Gross loans	0	0
Business Loans | Doubtful | Commercial owner occupied
Credit Risk Grades
Gross loans	0	0
Business Loans | Doubtful | SBA
Credit Risk Grades
Gross loans	0	0
Business Loans | Doubtful | Agribusiness
Credit Risk Grades
Gross loans	0
Real Estate Loans | Commercial non-owner occupied
Credit Risk Grades
Gross loans	2,004,536	1,243,115
Real Estate Loans | Multi-family
Credit Risk Grades
Gross loans	1,535,289	794,384
Real Estate Loans | One-to-four family
Credit Risk Grades
Gross loans	356,264	270,894
Real Estate Loans | Construction
Credit Risk Grades
Gross loans	523,643	282,811
Real Estate Loans | Farmland
Credit Risk Grades
Gross loans	150,502	145,393
Real Estate Loans | Land
Credit Risk Grades
Gross loans	46,628	31,233
Real Estate Loans | Pass | Commercial non-owner occupied
Credit Risk Grades
Gross loans	1,998,118	1,242,045
Real Estate Loans | Pass | Multi-family
Credit Risk Grades
Gross loans	1,530,567	794,156
Real Estate Loans | Pass | One-to-four family
Credit Risk Grades
Gross loans	350,083	268,776
Real Estate Loans | Pass | Construction
Credit Risk Grades
Gross loans	523,643	282,294
Real Estate Loans | Pass | Farmland
Credit Risk Grades
Gross loans	150,381	144,234
Real Estate Loans | Pass | Land
Credit Risk Grades
Gross loans	46,008	30,979
Real Estate Loans | Special Mention | Commercial non-owner occupied
Credit Risk Grades
Gross loans	731	0
Real Estate Loans | Special Mention | Multi-family
Credit Risk Grades
Gross loans	4,060	0
Real Estate Loans | Special Mention | One-to-four family
Credit Risk Grades
Gross loans	728	154
Real Estate Loans | Special Mention | Construction
Credit Risk Grades
Gross loans	0	517
Real Estate Loans | Special Mention | Farmland
Credit Risk Grades
Gross loans	0	44
Real Estate Loans | Special Mention | Land
Credit Risk Grades
Gross loans	132	0
Real Estate Loans | Substandard | Commercial non-owner occupied
Credit Risk Grades
Gross loans	5,687	1,070
Real Estate Loans | Substandard | Multi-family
Credit Risk Grades
Gross loans	662	228
Real Estate Loans | Substandard | One-to-four family
Credit Risk Grades
Gross loans	5,453	1,964
Real Estate Loans | Substandard | Construction
Credit Risk Grades
Gross loans	0	0
Real Estate Loans | Substandard | Farmland
Credit Risk Grades
Gross loans	121	1,115
Real Estate Loans | Substandard | Land
Credit Risk Grades
Gross loans	488	254
Real Estate Loans | Doubtful | Commercial non-owner occupied
Credit Risk Grades
Gross loans	0	0
Real Estate Loans | Doubtful | Multi-family
Credit Risk Grades
Gross loans	0	0
Real Estate Loans | Doubtful | One-to-four family
Credit Risk Grades
Gross loans	0	0
Real Estate Loans | Doubtful | Construction
Credit Risk Grades
Gross loans	0	0
Real Estate Loans | Doubtful | Farmland
Credit Risk Grades
Gross loans	0	0
Real Estate Loans | Doubtful | Land
Credit Risk Grades
Gross loans	0	0
Consumer Loans | Consumer loans
Credit Risk Grades
Gross loans	89,424	92,931
Consumer Loans | Pass | Consumer loans
Credit Risk Grades
Gross loans	89,321	92,794
Consumer Loans | Special Mention | Consumer loans
Credit Risk Grades
Gross loans	0	0
Consumer Loans | Substandard | Consumer loans
Credit Risk Grades
Gross loans	103	137
Consumer Loans | Doubtful | Consumer loans
Credit Risk Grades
Gross loans	$ 0	$ 0

Loans - Days past due and Non-a

Loans - Days past due and Non-accruing (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other information concerning the credit quality
Total Gross Loans	$ 8,852,005	$ 6,222,053
Non-accruing	4,857	3,284
Warehouse Facilities
Other information concerning the credit quality
Total Gross Loans		116,066
Current
Other information concerning the credit quality
Current	8,839,152	6,211,994
30-59
Other information concerning the credit quality
Days Past Due	7,046	5,964
60-89
Other information concerning the credit quality
Days Past Due	1,242	1,056
90
Other information concerning the credit quality
Days Past Due	4,565	3,039
Business Loans | Commercial and industrial
Other information concerning the credit quality
Total Gross Loans	1,364,461	1,086,659
Non-accruing	931	1,160
Business Loans | Franchise
Other information concerning the credit quality
Total Gross Loans	765,416	660,415
Non-accruing	190	0
Business Loans | Commercial owner occupied
Other information concerning the credit quality
Total Gross Loans	1,679,122	1,295,214
Non-accruing	599	97
Business Loans | SBA
Other information concerning the credit quality
Total Gross Loans	198,201	202,938
Non-accruing	2,739	1,201
Business Loans | Warehouse Facilities
Other information concerning the credit quality
Total Gross Loans		116,066
Non-accruing		0
Business Loans | Agribusiness
Other information concerning the credit quality
Total Gross Loans	138,519
Non-accruing	0
Business Loans | Current | Commercial and industrial
Other information concerning the credit quality
Current	1,362,017	1,085,770
Business Loans | Current | Franchise
Other information concerning the credit quality
Current	759,546	660,415
Business Loans | Current | Commercial owner occupied
Other information concerning the credit quality
Current	1,677,967	1,291,254
Business Loans | Current | SBA
Other information concerning the credit quality
Current	195,051	200,821
Business Loans | Current | Warehouse Facilities
Other information concerning the credit quality
Current		116,066
Business Loans | Current | Agribusiness
Other information concerning the credit quality
Current	138,519
Business Loans | 30-59 | Commercial and industrial
Other information concerning the credit quality
Days Past Due	309	84
Business Loans | 30-59 | Franchise
Other information concerning the credit quality
Days Past Due	5,680	0
Business Loans | 30-59 | Commercial owner occupied
Other information concerning the credit quality
Days Past Due	343	3,474
Business Loans | 30-59 | SBA
Other information concerning the credit quality
Days Past Due	524	177
Business Loans | 30-59 | Warehouse Facilities
Other information concerning the credit quality
Days Past Due		0
Business Loans | 30-59 | Agribusiness
Other information concerning the credit quality
Days Past Due	0
Business Loans | 60-89 | Commercial and industrial
Other information concerning the credit quality
Days Past Due	1,204	570
Business Loans | 60-89 | Franchise
Other information concerning the credit quality
Days Past Due	0	0
Business Loans | 60-89 | Commercial owner occupied
Other information concerning the credit quality
Days Past Due	0	486
Business Loans | 60-89 | SBA
Other information concerning the credit quality
Days Past Due	0	0
Business Loans | 60-89 | Warehouse Facilities
Other information concerning the credit quality
Days Past Due		0
Business Loans | 60-89 | Agribusiness
Other information concerning the credit quality
Days Past Due	0
Business Loans | 90 | Commercial and industrial
Other information concerning the credit quality
Days Past Due	931	235
Business Loans | 90 | Franchise
Other information concerning the credit quality
Days Past Due	190	0
Business Loans | 90 | Commercial owner occupied
Other information concerning the credit quality
Days Past Due	812	0
Business Loans | 90 | SBA
Other information concerning the credit quality
Days Past Due	2,626	1,940
Business Loans | 90 | Warehouse Facilities
Other information concerning the credit quality
Days Past Due		0
Business Loans | 90 | Agribusiness
Other information concerning the credit quality
Days Past Due	0
Real Estate Loans | Commercial non-owner occupied
Other information concerning the credit quality
Total Gross Loans	2,004,536	1,243,115
Non-accruing	0	0
Real Estate Loans | Multi-family
Other information concerning the credit quality
Total Gross Loans	1,535,289	794,384
Non-accruing	0	0
Real Estate Loans | One-to-four family
Other information concerning the credit quality
Total Gross Loans	356,264	270,894
Non-accruing	398	817
Real Estate Loans | Construction
Other information concerning the credit quality
Total Gross Loans	523,643	282,811
Non-accruing	0	0
Real Estate Loans | Farmland
Other information concerning the credit quality
Total Gross Loans	150,502	145,393
Non-accruing	0	0
Real Estate Loans | Land
Other information concerning the credit quality
Total Gross Loans	46,628	31,233
Non-accruing	0	9
Real Estate Loans | Current | Commercial non-owner occupied
Other information concerning the credit quality
Current	2,004,536	1,243,115
Real Estate Loans | Current | Multi-family
Other information concerning the credit quality
Current	1,535,275	792,603
Real Estate Loans | Current | One-to-four family
Other information concerning the credit quality
Current	356,219	269,725
Real Estate Loans | Current | Construction
Other information concerning the credit quality
Current	523,643	282,811
Real Estate Loans | Current | Farmland
Other information concerning the credit quality
Current	150,502	145,393
Real Estate Loans | Current | Land
Other information concerning the credit quality
Current	46,628	31,141
Real Estate Loans | 30-59 | Commercial non-owner occupied
Other information concerning the credit quality
Days Past Due	0	0
Real Estate Loans | 30-59 | Multi-family
Other information concerning the credit quality
Days Past Due	14	1,781
Real Estate Loans | 30-59 | One-to-four family
Other information concerning the credit quality
Days Past Due	30	354
Real Estate Loans | 30-59 | Construction
Other information concerning the credit quality
Days Past Due	0	0
Real Estate Loans | 30-59 | Farmland
Other information concerning the credit quality
Days Past Due	0	0
Real Estate Loans | 30-59 | Land
Other information concerning the credit quality
Days Past Due	0	83
Real Estate Loans | 60-89 | Commercial non-owner occupied
Other information concerning the credit quality
Days Past Due	0	0
Real Estate Loans | 60-89 | Multi-family
Other information concerning the credit quality
Days Past Due	0	0
Real Estate Loans | 60-89 | One-to-four family
Other information concerning the credit quality
Days Past Due	9	0
Real Estate Loans | 60-89 | Construction
Other information concerning the credit quality
Days Past Due	0	0
Real Estate Loans | 60-89 | Farmland
Other information concerning the credit quality
Days Past Due	0	0
Real Estate Loans | 60-89 | Land
Other information concerning the credit quality
Days Past Due	0	0
Real Estate Loans | 90 | Commercial non-owner occupied
Other information concerning the credit quality
Days Past Due	0	0
Real Estate Loans | 90 | Multi-family
Other information concerning the credit quality
Days Past Due	0	0
Real Estate Loans | 90 | One-to-four family
Other information concerning the credit quality
Days Past Due	6	815
Real Estate Loans | 90 | Construction
Other information concerning the credit quality
Days Past Due	0	0
Real Estate Loans | 90 | Farmland
Other information concerning the credit quality
Days Past Due	0	0
Real Estate Loans | 90 | Land
Other information concerning the credit quality
Days Past Due	0	9
Consumer Loans | Consumer loans
Other information concerning the credit quality
Total Gross Loans	89,424	92,931
Non-accruing	0	0
Consumer Loans | Current | Consumer loans
Other information concerning the credit quality
Current	89,249	92,880
Consumer Loans | 30-59 | Consumer loans
Other information concerning the credit quality
Days Past Due	146	11
Consumer Loans | 60-89 | Consumer loans
Other information concerning the credit quality
Days Past Due	29	0
Consumer Loans | 90 | Consumer loans
Other information concerning the credit quality
Days Past Due	$ 0	$ 40

Allowance for Loan Losses (Deta

Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				$ 28,936				$ 21,296	$ 28,936	$ 21,296	$ 17,317
Charge-offs									(1,955)	(1,362)	(5,242)
Recoveries									935	362	445
Provisions for (reduction in) loan losses	$ 2,258	$ 1,981	$ 1,761	2,253	$ 2,194	$ 2,049	$ 1,945	2,244	8,156	8,640	8,776
Balance, at the end of the period	36,072				28,936				36,072	28,936	21,296
Amount of allowance attributed to:
Specifically evaluated impaired loans	584				55				584	55	250
General portfolio allocation	35,488				28,881				35,488	28,881	21,046
Loans individually evaluated for impairment	12,458				3,284				$ 12,458	$ 3,284	$ 1,141
Specific reserves to total loans individually evaluated for impairment									4.69%	1.67%	21.91%
Loans collectively evaluated for impairment	8,833,828				6,195,343				$ 8,833,828	$ 6,195,343	$ 3,236,842
General reserves to total loans collectively evaluated for impairment									0.40%	0.47%	0.65%
Total gross loans	8,846,286				6,198,627				$ 8,846,286	$ 6,198,627	$ 3,237,983
Total allowance to gross loans									0.41%	0.47%	0.66%
Owner Occupied Commercial Real Estate Loans Commercial and Industrial Loans and Small Business Administration Loans
Allowance for Loan Losses
Period considered for comparison of allowance for loan losses factor									1 year 4 months 24 days
Business Loans | Commercial and industrial
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				9,721				6,362	$ 9,721	$ 6,362	$ 3,449
Charge-offs									(1,411)	(1,344)	(2,802)
Recoveries									698	94	177
Provisions for (reduction in) loan losses									1,813	4,609	5,538
Balance, at the end of the period	10,821				9,721				10,821	9,721	6,362
Amount of allowance attributed to:
Specifically evaluated impaired loans	118				0				118	0	250
General portfolio allocation	10,703				9,721				10,703	9,721	6,112
Loans individually evaluated for impairment	1,023				1,160				$ 1,023	$ 1,160	$ 250
Specific reserves to total loans individually evaluated for impairment									11.53%	0.00%	100.00%
Loans collectively evaluated for impairment	1,363,400				1,085,499				$ 1,363,400	$ 1,085,499	$ 562,919
General reserves to total loans collectively evaluated for impairment									0.79%	0.90%	1.09%
Total gross loans	1,364,423				1,086,659				$ 1,364,423	$ 1,086,659	$ 563,169
Total allowance to gross loans									0.79%	0.89%	1.13%
Business Loans | Franchise
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				5,797				3,845	$ 5,797	$ 3,845	$ 3,124
Charge-offs									0	0	(980)
Recoveries									0	0	0
Provisions for (reduction in) loan losses									703	1,952	1,701
Balance, at the end of the period	6,500				5,797				6,500	5,797	3,845
Amount of allowance attributed to:
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	6,500				5,797				6,500	5,797	3,845
Loans individually evaluated for impairment	189				0				$ 189	$ 0	$ 0
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	765,227				660,414				$ 765,227	$ 660,414	$ 459,421
General reserves to total loans collectively evaluated for impairment									0.85%	0.88%	0.84%
Total gross loans	765,416				660,414				$ 765,416	$ 660,414	$ 459,421
Total allowance to gross loans									0.85%	0.88%	0.84%
Business Loans | Commercial owner occupied
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				767				1,193	$ 767	$ 1,193	$ 1,870
Charge-offs									(33)	0	(329)
Recoveries									47	105	25
Provisions for (reduction in) loan losses									605	(531)	(373)
Balance, at the end of the period	1,386				767				1,386	767	1,193
Amount of allowance attributed to:
Specifically evaluated impaired loans	0				55				0	55	0
General portfolio allocation	1,386				712				1,386	712	1,193
Loans individually evaluated for impairment	599				97				$ 599	$ 97	$ 436
Specific reserves to total loans individually evaluated for impairment									0.00%	56.70%	0.00%
Loans collectively evaluated for impairment	1,678,523				1,289,116				$ 1,678,523	$ 1,289,116	$ 454,482
General reserves to total loans collectively evaluated for impairment									0.08%	0.06%	0.26%
Total gross loans	1,679,122				1,289,213				$ 1,679,122	$ 1,289,213	$ 454,918
Total allowance to gross loans									0.08%	0.06%	0.26%
Business Loans | SBA
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				2,890				1,039	$ 2,890	$ 1,039	$ 1,500
Charge-offs									(102)	(8)	(980)
Recoveries									169	127	193
Provisions for (reduction in) loan losses									1,331	1,732	326
Balance, at the end of the period	4,288				2,890				4,288	2,890	1,039
Amount of allowance attributed to:
Specifically evaluated impaired loans	466				0				466	0	0
General portfolio allocation	3,822				2,890				3,822	2,890	1,039
Loans individually evaluated for impairment	2,739				1,201				$ 2,739	$ 1,201	$ 316
Specific reserves to total loans individually evaluated for impairment									17.01%	0.00%	0.00%
Loans collectively evaluated for impairment	191,143				184,313				$ 191,143	$ 184,313	$ 88,678
General reserves to total loans collectively evaluated for impairment									2.00%	1.57%	1.17%
Total gross loans	193,882				185,514				$ 193,882	$ 185,514	$ 88,994
Total allowance to gross loans									2.21%	1.56%	1.17%
Business Loans | Agribusiness
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				1,291				0	$ 1,291	$ 0	$ 0
Charge-offs									0	0	0
Recoveries									0	0	0
Provisions for (reduction in) loan losses									1,992	1,291	0
Balance, at the end of the period	3,283				1,291				3,283	1,291	0
Amount of allowance attributed to:
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	3,283				1,291				3,283	1,291	0
Loans individually evaluated for impairment	7,500				0				$ 7,500	$ 0	$ 0
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	131,019				116,066				$ 131,019	$ 116,066	$ 0
General reserves to total loans collectively evaluated for impairment									2.51%	1.11%	0.00%
Total gross loans	138,519				116,066				$ 138,519	$ 116,066	$ 0
Total allowance to gross loans									2.37%	1.11%	0.00%
Business Loans | Warehouse Facilities
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				0				0	$ 0	$ 0	$ 759
Charge-offs									0	0	0
Recoveries									0	0	0
Provisions for (reduction in) loan losses									0	0	(759)
Balance, at the end of the period	0				0				0	0	0
Amount of allowance attributed to:
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	0				0				0	0	0
Loans individually evaluated for impairment	0				0				$ 0	$ 0	$ 0
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	0				0				$ 0	$ 0	$ 0
General reserves to total loans collectively evaluated for impairment									0.00%	0.00%	0.00%
Total gross loans	0				0				$ 0	$ 0	$ 0
Total allowance to gross loans									0.00%	0.00%	0.00%
Real Estate Loans | Commercial non-owner occupied
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				1,266				1,715	$ 1,266	$ 1,715	$ 2,048
Charge-offs									0	0	0
Recoveries									0	0	21
Provisions for (reduction in) loan losses									338	(449)	(354)
Balance, at the end of the period	1,604				1,266				1,604	1,266	1,715
Amount of allowance attributed to:
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	1,604				1,266				1,604	1,266	1,715
Loans individually evaluated for impairment	0				0				$ 0	$ 0	$ 0
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	2,003,174				1,243,115				$ 2,003,174	$ 1,243,115	$ 586,975
General reserves to total loans collectively evaluated for impairment									0.08%	0.10%	0.29%
Total gross loans	2,003,174				1,243,115				$ 2,003,174	$ 1,243,115	$ 586,975
Total allowance to gross loans									0.08%	0.10%	0.29%
Real Estate Loans | Multi-family
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				607				2,927	$ 607	$ 2,927	$ 1,583
Charge-offs									0	0	0
Recoveries									0	0	0
Provisions for (reduction in) loan losses									118	(2,320)	1,344
Balance, at the end of the period	725				607				725	607	2,927
Amount of allowance attributed to:
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	725				607				725	607	2,927
Loans individually evaluated for impairment	0				0				$ 0	$ 0	$ 0
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	1,535,289				794,384				$ 1,535,289	$ 794,384	$ 690,955
General reserves to total loans collectively evaluated for impairment									0.05%	0.08%	0.42%
Total gross loans	1,535,289				794,384				$ 1,535,289	$ 794,384	$ 690,955
Total allowance to gross loans									0.05%	0.08%	0.42%
Real Estate Loans | One-to-four family
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				803				365	$ 803	$ 365	$ 698
Charge-offs									0	(10)	(151)
Recoveries									13	35	25
Provisions for (reduction in) loan losses									(11)	413	(207)
Balance, at the end of the period	805				803				805	803	365
Amount of allowance attributed to:
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	805				803				805	803	365
Loans individually evaluated for impairment	408				817				$ 408	$ 817	$ 124
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	355,856				270,077				$ 355,856	$ 270,077	$ 100,327
General reserves to total loans collectively evaluated for impairment									0.23%	0.30%	0.36%
Total gross loans	356,264				270,894				$ 356,264	$ 270,894	$ 100,451
Total allowance to gross loans									0.23%	0.30%	0.36%
Real Estate Loans | Construction
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				4,569				3,632	$ 4,569	$ 3,632	$ 2,030
Charge-offs									0	0	0
Recoveries									0	0	0
Provisions for (reduction in) loan losses									597	937	1,602
Balance, at the end of the period	5,166				4,569				5,166	4,569	3,632
Amount of allowance attributed to:
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	5,166				4,569				5,166	4,569	3,632
Loans individually evaluated for impairment	0				0				$ 0	$ 0	$ 0
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	523,643				282,811				$ 523,643	$ 282,811	$ 269,159
General reserves to total loans collectively evaluated for impairment									0.99%	1.62%	1.35%
Total gross loans	523,643				282,811				$ 523,643	$ 282,811	$ 269,159
Total allowance to gross loans									0.99%	1.62%	1.35%
Real Estate Loans | Farmland
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				137				0	$ 137	$ 0	$ 0
Charge-offs									0	0	0
Recoveries									0	0	0
Provisions for (reduction in) loan losses									366	137	0
Balance, at the end of the period	503				137				503	137	0
Amount of allowance attributed to:
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	503				137				503	137	0
Loans individually evaluated for impairment	0				0				$ 0	$ 0	$ 0
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	150,502				145,393				$ 150,502	$ 145,393	$ 0
General reserves to total loans collectively evaluated for impairment									0.33%	0.09%	0.00%
Total gross loans	150,502				145,393				$ 150,502	$ 145,393	$ 0
Total allowance to gross loans									0.33%	0.09%	0.00%
Real Estate Loans | Land
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				993				198	$ 993	$ 198	$ 233
Charge-offs									0	0	0
Recoveries									0	0	0
Provisions for (reduction in) loan losses									(221)	795	(35)
Balance, at the end of the period	772				993				772	993	198
Amount of allowance attributed to:
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	772				993				772	993	198
Loans individually evaluated for impairment	0				9				$ 0	$ 9	$ 15
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	46,628				31,224				$ 46,628	$ 31,224	$ 19,814
General reserves to total loans collectively evaluated for impairment									1.66%	3.18%	1.00%
Total gross loans	46,628				31,233				$ 46,628	$ 31,233	$ 19,829
Total allowance to gross loans									1.66%	3.18%	1.00%
Consumer Loans | Consumer loans
Allocation of allowance as well as the activity in allowance
Balance, at the beginning of the period				$ 95				$ 20	$ 95	$ 20	$ 23
Charge-offs									(409)	0	0
Recoveries									8	1	4
Provisions for (reduction in) loan losses									525	74	(7)
Balance, at the end of the period	219				95				219	95	20
Amount of allowance attributed to:
Specifically evaluated impaired loans	0				0				0	0	0
General portfolio allocation	219				95				219	95	20
Loans individually evaluated for impairment	0				0				$ 0	$ 0	$ 0
Specific reserves to total loans individually evaluated for impairment									0.00%	0.00%	0.00%
Loans collectively evaluated for impairment	89,424				92,931				$ 89,424	$ 92,931	$ 4,112
General reserves to total loans collectively evaluated for impairment									0.24%	0.10%	0.49%
Total gross loans	$ 89,424				$ 92,931				$ 89,424	$ 92,931	$ 4,112
Total allowance to gross loans									0.24%	0.10%	0.49%

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Real Estate Owned
Balance, beginning of year	$ 326	$ 460	$ 1,161
Acquisitions	524	326	197
Foreclosures	15	0	0
Sales	(1,055)	(507)	(577)
Gain (loss) on sale	346	47	18
Write downs	(9)	0	(339)
Balance, end of year	147	326	$ 460
Consumer mortgage loans collateralized by residential real estate, foreclosure proceedings in process	$ 0	$ 73

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Premises and Equipment
Subtotal	$ 89,254	$ 71,480
Less: accumulated depreciation	24,563	18,325
Total	64,691	53,155
Depreciation expense for premises and equipment	7,700	4,900	$ 2,900
Land
Premises and Equipment
Subtotal	18,902	16,920
Premises
Premises and Equipment
Subtotal	25,361	19,868
Leasehold improvements
Premises and Equipment
Subtotal	15,824	14,025
Furniture, fixtures and equipment
Premises and Equipment
Subtotal	28,994	20,480
Automobiles
Premises and Equipment
Subtotal	$ 173	$ 187

Goodwill and Core Deposit Int_3

Goodwill and Core Deposit Intangibles - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 01, 2018	Apr. 01, 2018	Nov. 01, 2017	Apr. 01, 2017	Dec. 31, 2015
Goodwill [Line Items]
Goodwill	$ 808,726,000	$ 808,726,000	$ 493,329,000	$ 102,490,000					$ 50,832,000
Goodwill acquired during the year		313,043,000	390,839,000	51,658,000
Impairment losses	0	0	0	0
Net CDI	100,556,000	100,556,000	43,014,000	9,451,000
Additions due to acquisitions		71,136,000	$ 39,707,000	$ 4,320,000
Estimated aggregate amortization expense
2,019	17,200,000	17,200,000
2,020	15,400,000	15,400,000
2,021	13,400,000	13,400,000
2,022	11,700,000	11,700,000
2,023	10,200,000	10,200,000
Grandpoint Capital, Inc.
Goodwill [Line Items]
Goodwill	$ 313,043,000	313,043,000
Goodwill acquired during the year		313,000,000
Additions due to acquisitions		71,100,000
Plaza Bancorp
Goodwill [Line Items]
Goodwill					$ 123,640,000		$ 124,000,000
Goodwill acquired during the year		1,800,000
Heritage Oaks Bank
Goodwill [Line Items]
Goodwill						$ 269,553,000		$ 270,000,000
Goodwill acquired during the year		$ 600,000

Goodwill and Core Deposit Int_4

Goodwill and Core Deposit Intangibles - Goodwill Roll Forward (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Balance, beginning of year		$ 493,329,000	$ 102,490,000	$ 50,832,000
Goodwill acquired during the year		313,043,000	390,839,000	51,658,000
Purchase Accounting Adjustments		2,354,000	0	0
Impairment losses	$ 0	0	0	0
Balance, end of year	808,726,000	808,726,000	493,329,000	102,490,000
Accumulated impairment losses at end of year	$ 0	$ 0	$ 0	$ 0

Goodwill and Core Deposit Int_5

Goodwill and Core Deposit Intangibles - CDI Roll Forward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Gross amount of CDI:
Balance, beginning of year	$ 54,809	$ 15,102	$ 10,782
Additions due to acquisitions	71,136	39,707	4,320
Balance, end of year	125,945	54,809	15,102
Accumulated amortization:
Balance, beginning of year	(11,795)	(5,651)	(3,612)
Amortization	(13,594)	(6,144)	(2,039)
Balance, end of year	(25,389)	(11,795)	(5,651)
Net CDI, end of year	$ 100,556	$ 43,014	$ 9,451

Bank Owned Life Insurance (Deta

Bank Owned Life Insurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments, All Other Investments [Abstract]
Bank owned life insurance	$ 110,871	$ 75,976
Income from bank owned life insurance, non-interest income	$ 3,400	$ 2,300	$ 1,400

Qualified Affordable Housing _3

Qualified Affordable Housing Project Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Original Investment Value	$ 51,181	$ 16,181
Current Recorded Investment	39,407	11,582
Unfunded Liability Obligation	13,382	1,300
Tax Credits and Tax Deductions	8,984	2,514
Amortization of Investments	4,574	1,599
Net Income Tax Benefit	$ (5,207)	(2,135)
Period of tax credits	10 years
WNC Institutional Tax Credit Fund X, CA Series 11 L.P.
Schedule of Equity Method Investments [Line Items]
Original Investment Value	$ 5,000	5,000
Current Recorded Investment	2,250	2,750
Unfunded Liability Obligation	0	85
Tax Credits and Tax Deductions	715	455
Amortization of Investments	500	500
Net Income Tax Benefit	(675)	(663)
WNC Institutional Tax Credit Fund X, CA Series 12, L.P.
Schedule of Equity Method Investments [Line Items]
Original Investment Value	5,000	5,000
Current Recorded Investment	2,750	3,250
Unfunded Liability Obligation	136	288
Tax Credits and Tax Deductions	786	482
Amortization of Investments	500	500
Net Income Tax Benefit	(703)	(690)
Sycamore Court
Schedule of Equity Method Investments [Line Items]
Original Investment Value	6,181	6,181
Current Recorded Investment	4,580	5,582
Unfunded Liability Obligation	927	927
Tax Credits and Tax Deductions	1,141	1,577
Amortization of Investments	1,003	599
Net Income Tax Benefit	(766)	$ (782)
R4 CA Housing
Schedule of Equity Method Investments [Line Items]
Original Investment Value	15,000
Current Recorded Investment	13,426
Unfunded Liability Obligation	9,405
Tax Credits and Tax Deductions	4,721
Amortization of Investments	1,574
Net Income Tax Benefit	(1,950)
Cypress Cove
Schedule of Equity Method Investments [Line Items]
Original Investment Value	20,000
Current Recorded Investment	16,401
Unfunded Liability Obligation	2,914
Tax Credits and Tax Deductions	1,621
Amortization of Investments	997
Net Income Tax Benefit	$ (1,113)

Deposit Accounts - Deposit acco

Deposit Accounts - Deposit accounts and weighted average interest rates (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Transaction accounts
Noninterest-bearing checking	$ 3,495,737	$ 2,226,876
Interest-bearing checking	526,088	365,193
Money market	2,975,578	2,181,571
Savings	250,271	227,436
Total transaction accounts	7,247,674	5,001,076
Certificates of deposit accounts
250,000 or less	569,877	562,147
Greater than $250,000	840,800	522,663
Total certificates of deposit accounts	1,410,677	1,084,810
Total deposits	$ 8,658,351	$ 6,085,886
Transaction accounts
Noninterest-bearing checking (as a percent)	0.00%	0.00%
Interest-bearing checking (as a percent)	0.38%	0.13%
Money market (as a percent)	0.89%	0.48%
Savings (as a percent)	0.14%	0.13%
Total transaction accounts (as a percent)	0.37%	0.21%
Certificates of deposit accounts
Less than $100,000 (as a percent)	1.44%	0.96%
Greater than $250,000 (as a percent)	2.12%	1.26%
Total certificates of deposit accounts (as a percent)	1.84%	1.10%
Total deposits (as a percent)	0.63%	0.33%

Deposit Accounts - The aggregat

Deposit Accounts - The aggregate annual maturities of certificates of deposit accounts (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Balance
Within 3 months	$ 479,572
4 to 6 months	365,578
7 to 12 months	264,838
13 to 24 months	179,590
25 to 36 months	43,103
37 to 60 months	13,380
Over 60 months	64,616
Total certificates of deposit accounts	$ 1,410,677	$ 1,084,810
Weighted Average Interest Rate
Within 3 months (as a percent)	1.88%
4 to 6 months (as a percent)	2.03%
7 to 12 months (as a percent)	1.68%
13 to 24 months (as a percent)	1.92%
25 to 36 months (as a percent)	2.01%
37 to 60 months (as a percent)	1.74%
Over 60 months (as a percent)	0.92%
Total certificates of deposit accounts (as a percent)	1.84%	1.10%

Deposit Accounts - Interest exp

Deposit Accounts - Interest expense on deposit accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest expense on deposit accounts
Checking accounts	$ 1,167	$ 365	$ 200
Money market accounts	19,567	6,720	3,641
Savings	357	251	151
Certificates of deposit accounts	16,562	6,035	4,399
Total	37,653	13,371	$ 8,391
Accrued interest on deposits	$ 1,742	$ 526

Federal Home Loan Bank Advanc_3

Federal Home Loan Bank Advances and Other Borrowings (Details)	12 Months Ended
	Dec. 31, 2018USD ($)bank	Dec. 31, 2017USD ($)	Jun. 30, 2017USD ($)
Federal Home Loan Bank Advances and Other Borrowings
Maximum percentage of assets up to which advances will be provided by FHLB	45.00%
Maximum credit line available from FHLB	$ 5,180,000,000
Additional available advances	1,784,000,000
Aggregate principal balance of real estate loans used to collateralize FHLB advances	3,300,000,000
FHLB stock	19,600,000
Overnight FHLB advances	506,000,000	$ 310,000,000
Maximum amount outstanding in respect of term advances	$ 161,500,000	180,000,000
Fair value of securities pledged as collateral for the Bank's inverse putable reverse repurchases		$ 27,300,000
Weighted average interest rate during the year	2.51%	1.19%
Average balance of repurchase agreement facilities	$ 15,000,000
Reverse repurchase facility
Federal Home Loan Bank Advances and Other Borrowings
Estimated fair value of MBS used to secure outstanding borrowings	$ 75,000
Weighted average interest rate during the year	0.01%
Investment securities, fair value	$ 20,900,000
Unsecured lines of credit
Federal Home Loan Bank Advances and Other Borrowings
Unused facility	$ 168,000,000
Number of correspondent banks | bank	8
Amount outstanding	$ 0	$ 0
Federal Reserve discount window
Federal Home Loan Bank Advances and Other Borrowings
Unused facility	3,300,000
Citigroup | Line of Credit
Federal Home Loan Bank Advances and Other Borrowings
Balance outstanding at end of year		18,500,000
Barclays Bank | Line of Credit
Federal Home Loan Bank Advances and Other Borrowings
Balance outstanding at end of year		10,000,000
Union Bank | Reverse repurchase facility
Federal Home Loan Bank Advances and Other Borrowings
Unused facility	50,000,000	50,000,000
Wells Fargo Bank | Line of Credit
Federal Home Loan Bank Advances and Other Borrowings
Unused facility			$ 15,000,000
Amount outstanding	$ 0	$ 0
Minimum
Federal Home Loan Bank Advances and Other Borrowings
Term advances, rate	1.53%
Maximum
Federal Home Loan Bank Advances and Other Borrowings
Term advances, rate	2.73%

Federal Home Loan Bank Advanc_4

Federal Home Loan Bank Advances and Other Borrowings - Activities in advances from the FHLB (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Activities in advances from the FHLB
Average balance outstanding	$ 529,278	$ 290,839
Maximum amount outstanding at any month-end during the year	883,612	490,148
Balance outstanding at end of year	$ 667,606	$ 490,148
Weighted average interest rate during the year	2.51%	1.19%

Federal Home Loan Bank Advanc_5

Federal Home Loan Bank Advances and Other Borrowings - Activities in other borrowings (Details) - Other Borrowings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Average balance outstanding	$ 29,193	$ 50,866
Maximum amount outstanding at any month-end during the year	52,091	52,996
Balance outstanding at end of year	$ 75	$ 46,139
Weighted average interest rate during the year	0.01%	1.86%

Subordinated Debentures (Detail

Subordinated Debentures (Details)	Jul. 01, 2018USD ($)	Nov. 01, 2017USD ($)notes	Aug. 31, 2014USD ($)	Mar. 31, 2004USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Apr. 01, 2017USD ($)
Debt Instrument [Line Items]
Subordinated debentures					$ 110,313,000	$ 105,123,000
PPBI Trust I
Debt Instrument [Line Items]
Floating Rate Trust Preferred Securities issue amount				$ 10,000,000
Subordinated Notes Due 2024
Debt Instrument [Line Items]
Debt issued			$ 60,000,000
Fixed interest rate (as a percent)			5.75%
Subordinated debentures					59,300,000
Unamortized debt issuance costs					$ (688,000)
Contribution of net proceeds from the Private Placement to the Bank to support general corporate purposes			$ 50,000,000
Subordinated Debentures
Debt Instrument [Line Items]
Floating interest rate, basis points added to base rate (as a percent)					2.75%
Effective rate (as a percent)					5.19%
Subordinated Debentures | Mission Community Capital Trust I
Debt Instrument [Line Items]
Effective rate (as a percent)					5.39%
Purchase accounting fair value adjustments					$ 306,000
Debt assumed in acquisition					$ 2,800,000		$ 3,100,000
Subordinated Debentures | Santa Lucia Bancorp (CA) Capital Trust
Debt Instrument [Line Items]
Effective rate (as a percent)					3.92%
Purchase accounting fair value adjustments					$ 1,300,000
Debt assumed in acquisition					$ 3,800,000		5,200,000
Subordinated Debentures | LIBOR | Mission Community Capital Trust I
Debt Instrument [Line Items]
Floating interest rate, basis points added to base rate (as a percent)					2.95%
Subordinated Debentures | LIBOR | Santa Lucia Bancorp (CA) Capital Trust
Debt Instrument [Line Items]
Floating interest rate, basis points added to base rate (as a percent)					1.48%
Subordinated Debentures | Heritage Oaks Bank
Debt Instrument [Line Items]
Effective rate (as a percent)					4.12%
Purchase accounting fair value adjustments					$ 1,300,000
Debt assumed in acquisition					$ 4,000,000		$ 5,200,000
Subordinated Debentures | Heritage Oaks Bank | LIBOR
Debt Instrument [Line Items]
Floating interest rate, basis points added to base rate (as a percent)					1.72%
Subordinated Debentures | Plaza Bancorp
Debt Instrument [Line Items]
Purchase accounting fair value adjustments					$ 157,000
Carrying value of subordinated notes					25,200,000
Subordinated Debentures | Grandpoint Capital, Inc.
Debt Instrument [Line Items]
Effective rate (as a percent)	5.74%
Purchase accounting fair value adjustments					224,000
Debt assumed in acquisition	$ 5,200,000
Carrying value of subordinated notes					$ 4,900,000
Subordinated Debentures | Grandpoint Capital, Inc. | LIBOR
Debt Instrument [Line Items]
Floating interest rate, basis points added to base rate (as a percent)	2.95%
Subordinated Debentures | PPBI Trust I
Debt Instrument [Line Items]
Debt issued				$ 10,310,000
Minority interest purchased (as a percent)				3.00%
Amount of minority interest purchased				$ 310,000
Subordinated Notes 7.125% | Plaza Bancorp
Debt Instrument [Line Items]
Fixed interest rate (as a percent)		7.125%
Number of subordinated notes assumed | notes		3
Debt assumed in acquisition		$ 25,000,000
Redemption price (as a percent)		103.00%
Redemption price, subsequent reduction (as a percent)		50.00%

Subordinated Debentures - Activ

Subordinated Debentures - Activities for our subordinated debentures (Details) - Subordinated Debentures - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Average balance outstanding	$ 107,732	$ 81,466
Maximum amount outstanding at any month-end during the year	110,313	105,123
Balance outstanding at end of year	$ 110,313	$ 105,123
Weighted average interest rate during the year	6.23%	5.80%

Income Taxes - Total income tax

Income Taxes - Total income tax provision (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current income tax provision:
Federal									$ 19,787	$ 18,644	$ 16,928
State									13,178	7,062	4,655
Total current income tax provision									32,965	25,706	21,583
Deferred income tax provision (benefit):
Federal									8,142	8,294	2,379
Effect of Tax Act					$ 5,600				(1,441)	5,633	0
State									2,574	2,493	1,253
Total deferred income tax provision (benefit)									9,275	16,420	3,632
Total income tax provision	$ 15,376	$ 7,798	$ 10,182	$ 8,884	$ 19,370	$ 10,619	$ 7,521	$ 4,616	$ 42,240	$ 42,126	$ 25,215

Income Taxes - Reconciliation f

Income Taxes - Reconciliation from statutory federal income taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation from statutory federal income taxes to the company's effective income taxes
Statutory federal income tax provision									$ 34,803	$ 35,778	$ 22,863
State taxes, net of federal income tax effect									12,724	6,720	4,135
Cash surrender life insurance									(582)	(645)	(407)
Tax exempt interest									(1,135)	(1,660)	(764)
Merger costs									375	824	533
LIHTC investments									(761)	(1,031)	(909)
Effect of the Tax Act									(1,441)	5,633	0
Excess tax benefit of stock-based compensation									(1,811)	(1,995)	0
Prior year true-up									0	(1,108)	0
Other									68	(390)	(236)
Total income tax provision	$ 15,376	$ 7,798	$ 10,182	$ 8,884	$ 19,370	$ 10,619	$ 7,521	$ 4,616	$ 42,240	$ 42,126	$ 25,215

Income Taxes - Deferred tax ass

Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Accrued expenses	$ 3,239,000	$ 2,463,000	$ 2,839,000
Net operating loss	6,115,000	4,834,000	3,977,000
Allowance for loan losses, net of bad debt charge-offs	10,709,000	8,400,000	8,061,000
Deferred compensation	3,649,000	3,074,000	2,348,000
State taxes	2,707,000	1,500,000	1,879,000
Depreciation	0	0	1,090,000
Loan discount	17,677,000	8,642,000	3,477,000
Stock-based compensation	3,234,000	1,914,000	1,108,000
Unrealized loss on available for sale securities	2,308,000	0	1,939,000
Capital loss carryover	0	380,000	0
AMT credit	96,000	107,000	0
Total deferred tax assets	49,734,000	31,314,000	26,718,000
Deferred tax liabilities:
Deferred FDIC gain	(364,000)	(524,000)	(1,675,000)
Core deposit intangibles	(27,388,000)	(11,691,000)	(3,331,000)
Loan origination costs	(4,760,000)	(3,368,000)	(4,208,000)
Depreciation	(1,192,000)	(699,000)	0
Unrealized gain on available for sale securities	0	(188,000)	0
Other	(403,000)	(1,199,000)	(697,000)
Total deferred tax liabilities	(34,107,000)	(17,669,000)	(9,911,000)
Valuation allowance	0	(380,000)	0
Net deferred tax asset	$ 15,627,000	$ 13,265,000	$ 16,807,000

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes
Effect of Tax Act	$ 5,600,000	$ (1,441,000)	$ 5,633,000	$ 0
Income tax benefit recorded related to Tax Act		1,400,000
Valuation allowance	380,000	$ 0	380,000	0
Minimum cumulative change in ownership that could result in a Section 382 ownership change (as a percent)		50.00%
Amount of unrecognized tax benefits	2,906,000	$ 2,906,000	2,906,000	$ 0
Tax benefits that would impact the effective tax rate		0
Interest and penalties accrued related to unrecognized tax benefits	$ 104,000,000	246,000,000	$ 104,000,000
Federal income tax purpose
Income Taxes
Net operating loss carryforward		25,700,000
California franchise tax purpose
Income Taxes
Net operating loss carryforward		$ 8,900,000

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 2,906,000	$ 0
Additions based on tax positions related to prior years	0	2,906,000
Balance at December 31	$ 2,906,000	$ 2,906,000

Commitments, Contingencies an_3

Commitments, Contingencies and Concentrations of Risk (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employment Agreements
Rental expense	$ 9.2	$ 4.8	$ 4.4
CEO | Employment Agreements
Employment Agreements
Term of agreements (in years)	3 years
Chief Banking Officer | Employment Agreements
Employment Agreements
Term of agreements (in years)	3 years
Chief Financial Officer | Employment Agreements
Employment Agreements
Term of agreements (in years)	3 years
Chief Credit Officer | Employment Agreements
Employment Agreements
Term of agreements (in years)	3 years

Commitments, Contingencies an_4

Commitments, Contingencies and Concentrations of Risk - Minimum annual lease payments (Details) $ in Thousands	Dec. 31, 2018USD ($)
Lease Commitments
2,019	$ 11,468
2,020	10,869
2,021	10,133
2,022	9,296
2,023	8,124
Thereafter	10,518
Total	$ 60,408

Benefit Plans - 401(k) Plan (De

Benefit Plans - 401(k) Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Employer's match of employees' contributions of the first 3% of eligible compensation (as a percent)	100.00%	100.00%	100.00%
Percentage of eligible compensation, matched 100% by employer	3.00%	3.00%	3.00%
Employer's match of employees' contributions of the next 2% of eligible compensation (as a percent)	50.00%	50.00%	50.00%
Percentage of eligible compensation, matched 50% by employer	2.00%	2.00%	2.00%
Contributions made	$ 2,500	$ 1,400	$ 959
Minimum
Defined Benefit Plan Disclosure [Line Items]
Employee contribution, as a percentage of compensation	1.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Employee contribution, as a percentage of compensation	100.00%

Benefit Plans - Long-Term Incen

Benefit Plans - Long-Term Incentive Plan (Details)	1 Months Ended		12 Months Ended
	May 31, 2012shares	May 31, 2004shares	Dec. 31, 2018shares	May 31, 2017shares	May 31, 2015shares	May 31, 2014shares
2004 Long-Term Incentive Plan
Share based plans
Shares authorized		525,500
Term of plan (in years)		10 years
Vesting percentage per year		33.30%
Number of options outstanding (in shares)			40,105
Granted (in shares)			0
2012 Plan
Share based plans
Shares authorized	620,000			3,580,000		800,000
Term of plan (in years)	10 years
Number of options outstanding (in shares)			578,063
Granted (in shares)			3,272,558
2012 Plan | Minimum
Share based plans
Award vesting period (in years)	1 year
2012 Plan | Maximum
Share based plans
Award vesting period (in years)	3 years
2014 Plan
Share based plans
Shares authorized						1,420,000
2017 Plan
Share based plans
Shares authorized				5,000,000
2015 Equity Based Compensation Plan
Share based plans
Shares authorized			250,000		2,500,000
Shares issued ratio, actual number of shares			2
Shares issued ratio			1
Number of options outstanding (in shares)			27,815
Granted (in shares)			652,866
2005 Long-Term Incentive Plan
Share based plans
Number of options outstanding (in shares)			35,950
Granted (in shares)			0

Benefit Plans - Option Plans (D

Benefit Plans - Option Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Additional disclosure
Intrinsic value	$ 8,400	$ 7,700	$ 2,000
Compensation expense	$ 571	$ 927	$ 883
Stock option
Number of Stock Options Outstanding
Options outstanding at the beginning of the year (in shares)	954,523
Granted (in shares)	0
Exercised (in shares)	(255,178)
Forfeited and expired (in shares)	(17,412)
Options outstanding at the end of the year (in shares)	681,933	954,523
Vested at the end of the year (in shares)	635,396
Weighted Average Exercise Price Per Share
Options outstanding at the beginning of the year (in dollars per share)	$ 13.89
Granted (in dollars per share)	0
Exercised (in dollars per share)	9.71
Forfeited and expired (in dollars per share)	21.53
Options outstanding at the end of the year (in dollars per share)	15.26	$ 13.89
Vested at the end of the year (in dollars per shares)	$ 15.11
Weighted average remaining contractual life
Outstanding at the end of the year	5 years 3 months 4 days
Vested at the end of the year	5 years 15 days
Additional disclosure
Aggregate intrinsic value, outstanding	$ 6,962
Aggregate Intrinsic value, vested and expected to vest	6,715
Unrecognized compensation expense	$ 134

Benefit Plans - Restricted Stoc

Benefit Plans - Restricted Stock Awards and Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Weighted Average Grant-Date Fair Value per share
Compensation expense	$ 571	$ 927	$ 883
Restricted Stock
Shares
Unvested at the beginning of the year (in shares)	446,843
Granted (in shares)	328,358
Vested (in shares)	(125,038)
Forfeited (in shares)	(14,086)
Unvested at the end of the year (in shares)	636,077	446,843
Weighted Average Grant-Date Fair Value per share
Unvested at the beginning of the year (in dollars per share)	$ 29.61
Granted (in dollars per share)	41.92
Vested (in dollars per share)	28.53
Forfeited (in dollars per share)	38.18
Unvested at the end of the year (in dollars per share)	$ 35.98	$ 29.61
Compensation expense	$ 8,500	$ 5,000	$ 2,000
Grant date fair value	12,800
Unrecognized compensation expense	$ 13,000
Weighted-average period of recognition	1 year 11 months 1 day

Benefit Plans - Other Benefits

Benefit Plans - Other Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred compensation plan | Executive Officer
Benefit Plans
Amounts recorded as liability		$ 8,400	$ 5,700
SERP | Plaza Bancorp
Benefit Plans
Deferred compensation liability	$ 1,600	2,000
SERP | Deferred compensation plan | Executive Officer
Benefit Plans
Amounts expensed	827	721	$ 573
Amounts recorded as liability	$ 10,900	$ 8,300

Financial Instruments with Of_2

Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Undisbursed loans and unused lines of credit
Financial Instruments with Off-Balance Sheet Risk
Allowance for credit losses	$ 4.6	$ 1.9
Purchase accounting fair value adjustments	2.6
Commitments to extend credit
Financial Instruments with Off-Balance Sheet Risk
Financial instruments with off-balance sheet risk	1,800	$ 1,200
Undisbursed Commitments For C&I Loans
Financial Instruments with Off-Balance Sheet Risk
Financial instruments with off-balance sheet risk	$ 1,100

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Specifically evaluated impaired loans	$ 584	$ 55	$ 250
With Specific Allowance	$ 1,038

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Fair value estimates (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Investments held to maturity	$ 44,672	$ 18,082
Investment securities available-for-sale	1,103,222	787,429
Accrued interest receivable	37,837	27,060
Liabilities:
FHLB advances	667,606	490,148
Level 1
Assets:
Cash and cash equivalents	203,406	197,164
Investments held to maturity	0	0
Investment securities available-for-sale	0	0
Loans held for sale	0	0
Loans held for investment, net	0	0
Derivative asset	0	0
Accrued interest receivable	37,837	27,053
Liabilities:
Deposit accounts	7,247,673	5,001,053
FHLB advances	0	0
Other borrowings	0	0
Subordinated debentures	0	0
Derivative liability	0	0
Accrued interest payable	3,255	2,131
Level 2
Assets:
Cash and cash equivalents	0	0
Investments held to maturity	44,672	18,082
Investment securities available-for-sale	1,103,222	787,429
Loans held for sale	6,072	23,524
Loans held for investment, net	0	0
Derivative asset	1,681	1,135
Accrued interest receivable	0	0
Liabilities:
Deposit accounts	1,403,524	1,074,564
FHLB advances	666,864	489,823
Other borrowings	75	46,373
Subordinated debentures	115,613	115,159
Derivative liability	1,681	1,135
Accrued interest payable	0	0
Level 3
Assets:
Cash and cash equivalents	0	0
Investments held to maturity	0	0
Investment securities available-for-sale	0	0
Loans held for sale	0	0
Loans held for investment, net	8,697,594	6,269,366
Derivative asset	0	0
Accrued interest receivable	0	0
Liabilities:
Deposit accounts	0	0
FHLB advances	0	0
Other borrowings	0	0
Subordinated debentures	0	0
Derivative liability	0	0
Accrued interest payable	0	0
Carrying Amount
Assets:
Cash and cash equivalents	203,406	197,164
Investments held to maturity	45,210	18,291
Investment securities available-for-sale	1,103,222	787,429
Loans held for sale	5,719	23,426
Loans held for investment, net	8,836,818	6,167,532
Derivative asset	1,929	1,135
Accrued interest receivable	37,837	27,053
Liabilities:
Deposit accounts	8,658,351	6,085,868
FHLB advances	667,606	490,148
Other borrowings	75	46,139
Subordinated debentures	110,313	105,123
Derivative liability	1,929	1,135
Accrued interest payable	3,255	2,131
Estimated Fair Value
Assets:
Cash and cash equivalents	203,406	197,164
Investments held to maturity	44,672	18,082
Investment securities available-for-sale	1,103,222	787,429
Loans held for sale	6,072	23,524
Loans held for investment, net	8,697,594	6,269,366
Derivative asset	1,681	1,135
Accrued interest receivable	37,837	27,053
Liabilities:
Deposit accounts	8,651,197	6,075,617
FHLB advances	666,864	489,823
Other borrowings	75	46,373
Subordinated debentures	115,613	115,159
Derivative liability	1,681	1,135
Accrued interest payable	3,255	2,131
Bank Time Deposits | Level 1
Assets:
Cash and cash equivalents	6,143	6,633
Bank Time Deposits | Level 2
Assets:
Cash and cash equivalents	0	0
Bank Time Deposits | Level 3
Assets:
Cash and cash equivalents	0	0
Bank Time Deposits | Carrying Amount
Assets:
Cash and cash equivalents	6,143	6,633
Bank Time Deposits | Estimated Fair Value
Assets:
Cash and cash equivalents	$ 6,143	$ 6,633

Fair Value of Financial Instr_5

Fair Value of Financial Instruments - Assets measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Level 1
Financial assets
Derivative asset	$ 0	$ 0
Financial liabilities
Derivative liability	0	0
Level 2
Financial assets
Derivative asset	1,681	1,135
Financial liabilities
Derivative liability	1,681	1,135
Level 3
Financial assets
Derivative asset	0	0
Financial liabilities
Derivative liability	0	0
Estimated Fair Value
Financial assets
Derivative asset	1,681	1,135
Financial liabilities
Derivative liability	1,681	1,135
Recurring basis
Financial assets
Derivative asset	1,681	1,135
Financial liabilities
Derivative liability	1,681	1,135
Recurring basis | Level 1
Financial assets
Total securities available for sale:	0
Derivative asset	0	0
Financial liabilities
Derivative liability	0	0
Recurring basis | Level 2
Financial assets
Total securities available for sale:	1,103,222
Derivative asset	1,681	1,135
Financial liabilities
Derivative liability	1,681	1,135
Recurring basis | Level 3
Financial assets
Total securities available for sale:	0
Derivative asset	0	0
Financial liabilities
Derivative liability	0	0
Recurring basis | U.S. Treasury | Level 1
Financial assets
Total securities available for sale:	0	0
Recurring basis | U.S. Treasury | Level 2
Financial assets
Total securities available for sale:	60,912	47,209
Recurring basis | U.S. Treasury | Level 3
Financial assets
Total securities available for sale:	0	0
Recurring basis | Agency | Level 1
Financial assets
Total securities available for sale:	0	0
Recurring basis | Agency | Level 2
Financial assets
Total securities available for sale:	130,070	79,546
Recurring basis | Agency | Level 3
Financial assets
Total securities available for sale:	0	0
Recurring basis | Corporate | Level 1
Financial assets
Total securities available for sale:	0	0
Recurring basis | Corporate | Level 2
Financial assets
Total securities available for sale:	103,543	232,128
Recurring basis | Corporate | Level 3
Financial assets
Total securities available for sale:	0	0
Recurring basis | Municipal bonds | Level 1
Financial assets
Total securities available for sale:	0	0
Recurring basis | Municipal bonds | Level 2
Financial assets
Total securities available for sale:	238,630	33,781
Recurring basis | Municipal bonds | Level 3
Financial assets
Total securities available for sale:	0	0
Recurring basis | Collateralized mortgage obligation: residential | Level 1
Financial assets
Total securities available for sale:	0	0
Recurring basis | Collateralized mortgage obligation: residential | Level 2
Financial assets
Total securities available for sale:	24,338	394,765
Recurring basis | Collateralized mortgage obligation: residential | Level 3
Financial assets
Total securities available for sale:	0	0
Recurring basis | Mortgage-backed securities: residential | Level 1
Financial assets
Total securities available for sale:	0	0
Recurring basis | Mortgage-backed securities: residential | Level 2
Financial assets
Total securities available for sale:	545,729	787,429
Recurring basis | Mortgage-backed securities: residential | Level 3
Financial assets
Total securities available for sale:	0	0
Recurring basis | Estimated Fair Value
Financial assets
Total securities available for sale:	1,103,222
Recurring basis | Estimated Fair Value | U.S. Treasury
Financial assets
Total securities available for sale:	60,912	47,209
Recurring basis | Estimated Fair Value | Agency
Financial assets
Total securities available for sale:	130,070	79,546
Recurring basis | Estimated Fair Value | Corporate
Financial assets
Total securities available for sale:	103,543	232,128
Recurring basis | Estimated Fair Value | Municipal bonds
Financial assets
Total securities available for sale:	238,630	33,781
Recurring basis | Estimated Fair Value | Collateralized mortgage obligation: residential
Financial assets
Total securities available for sale:	24,338	394,765
Recurring basis | Estimated Fair Value | Mortgage-backed securities: residential
Financial assets
Total securities available for sale:	$ 545,729	$ 787,429

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Weighted average number of stock options excluded (in shares)									0	17,524	82,760
Income/(Loss) (numerator)
Net income applicable to earnings per share									$ 123,340	$ 60,100	$ 40,103
Basic earnings per share: Income available to common stockholders	$ 39,643	$ 28,392	$ 27,303	$ 28,002	$ 16,171	$ 20,232	$ 14,176	$ 9,521	123,340	60,100	40,103
Diluted earnings per share: Income available to common stockholders									$ 123,340	$ 60,100	$ 40,103
Shares (denominator)
Basic earnings per share: Income available to common stockholders (in shares)									53,963,047	37,705,556	26,931,634
Effect of dilutive securities: Warrants and stock option plans (in shares)									650,010	805,705	507,525
Diluted earnings per share: Income available to common stockholders (in shares)									54,613,057	38,511,261	27,439,159
Per Share Amount
Basic earnings per share: Income available to common stockholders (in dollars per share)	$ 0.64	$ 0.46	$ 0.59	$ 0.61	$ 0.37	$ 0.46	$ 0.36	$ 0.35	$ 2.29	$ 1.59	$ 1.49
Diluted earnings per share: Income available to common stockholders (in dollars per share)	$ 0.63	$ 0.46	$ 0.58	$ 0.60	$ 0.36	$ 0.46	$ 0.35	$ 0.34	$ 2.26	$ 1.56	$ 1.46

Derivative Instruments (Details

Derivative Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative assets, fair value	$ 1,681	$ 1,135
Derivative liabilities, fair value	1,681	1,135
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional	57,502	58,599
Derivative assets, fair value	1,681	1,135
Derivative liabilities, fair value	1,681	1,135
Not Designated as Hedging Instrument | Interest rate swap contracts
Derivative [Line Items]
Notional	57,502	58,599
Derivative assets, fair value	1,681	1,135
Derivative liabilities, fair value	$ 1,681	$ 1,135

Balance Sheet Offsetting (Detai

Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financial assets:
Gross Amounts Recognized in the Consolidated Balance Sheets	$ 2,177	$ 1,833
Gross Amounts Offset in the Consolidated Balance Sheets	(496)	(698)
Net Amounts Presented in the Consolidated Balance Sheets	1,681	1,135
Financial Instruments	0	0
Cash Collateral	0	0
Net Amount	1,681	1,135
Financial liabilities:
Gross Amounts Recognized in the Consolidated Balance Sheets	1,681	1,135
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts Presented in the Consolidated Balance Sheets	1,681	1,135
Financial Instruments	0	0
Cash Collateral	0	0
Net Amount	1,681	1,135
Not Designated as Hedging Instrument
Financial assets:
Gross Amounts Recognized in the Consolidated Balance Sheets	2,177	1,833
Gross Amounts Offset in the Consolidated Balance Sheets	(496)	(698)
Net Amounts Presented in the Consolidated Balance Sheets	1,681	1,135
Financial Instruments	0	0
Cash Collateral	0	0
Net Amount	1,681	1,135
Financial liabilities:
Gross Amounts Recognized in the Consolidated Balance Sheets	1,681	1,135
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts Presented in the Consolidated Balance Sheets	1,681	1,135
Financial Instruments	0	0
Cash Collateral	0	0
Net Amount	$ 1,681	$ 1,135

Revenue Recognition - Summary o

Revenue Recognition - Summary of Company's Revenue Streams (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
INTEREST INCOME
Loans									$ 415,410	$ 251,027	$ 157,935
Investment securities and other interest-earning assets									33,013	18,978	8,670
Total interest income	$ 136,021	$ 128,876	$ 92,699	$ 90,827	$ 85,684	$ 70,161	$ 68,733	$ 45,427	448,423	270,005	166,605
NONINTEREST INCOME
Loan servicing fees									1,445	787	1,032
Earnings on bank-owned life insurance									3,427	2,279	1,353
Net gain from sales of loans									10,759	12,468	9,539
Net gain from sales of investment securities									1,399	2,737	1,797
Other income									3,641	5,680	2,639
Total noninterest income	$ 6,970	$ 8,240	$ 8,151	$ 7,666	$ 9,451	$ 8,221	$ 8,759	$ 4,683	31,027	31,114	19,602
Service charges on deposit accounts
NONINTEREST INCOME
Noninterest income									5,128	3,273	1,459
Other service fee income
NONINTEREST INCOME
Noninterest income									902	1,847	1,516
Debit card interchange income
NONINTEREST INCOME
Noninterest income									4,326	2,043	267
Within Scope
NONINTEREST INCOME
Other income									1,242	491	449
Total noninterest income									11,598	7,654	3,691
Total revenues									11,598	7,654	3,691
Within Scope | Service charges on deposit accounts
NONINTEREST INCOME
Noninterest income									5,128	3,273	1,459
Within Scope | Other service fee income
NONINTEREST INCOME
Noninterest income									902	1,847	1,516
Within Scope | Debit card interchange income
NONINTEREST INCOME
Noninterest income									4,326	2,043	267
Out of Scope
INTEREST INCOME
Loans									415,410	251,027	157,935
Investment securities and other interest-earning assets									33,013	18,978	8,670
Total interest income									448,423	270,005	166,605
NONINTEREST INCOME
Loan servicing fees									1,445	787	1,032
Earnings on bank-owned life insurance									3,427	2,279	1,353
Net gain from sales of loans									10,759	12,468	9,539
Net gain from sales of investment securities									1,399	2,737	1,797
Other income									2,399	5,189	2,190
Total noninterest income									19,429	23,460	15,911
Total revenues									$ 467,852	$ 293,465	$ 182,516

Related Parties (Details)

Related Parties (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Related party deposits	$ 471.9	$ 378.2
Associa
Related Party Transaction [Line Items]
Related party deposits	436.2	367.9
Executive Officers And Directors
Related Party Transaction [Line Items]
Loan receivable	$ 5.8	$ 6.1

Quarterly Results of Operatio_3

Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 136,021	$ 128,876	$ 92,699	$ 90,827	$ 85,684	$ 70,161	$ 68,733	$ 45,427	$ 448,423	$ 270,005	$ 166,605
Interest expense	18,475	16,163	11,528	9,546	7,514	5,870	5,395	3,724	55,712	22,503	13,530
Provision for credit losses	2,258	1,981	1,761	2,253	2,194	2,049	1,945	2,244	8,156	8,640	8,776
Noninterest income	6,970	8,240	8,151	7,666	9,451	8,221	8,759	4,683	31,027	31,114	19,602
Noninterest expense	67,239	82,782	50,076	49,808	49,886	39,612	48,455	30,005	249,905	167,958	98,063
Income tax provision	15,376	7,798	10,182	8,884	19,370	10,619	7,521	4,616	42,240	42,126	25,215
Net income	$ 39,643	$ 28,392	$ 27,303	$ 28,002	$ 16,171	$ 20,232	$ 14,176	$ 9,521	$ 123,340	$ 60,100	$ 40,103
Earnings per share:
Basic (in dollars per share)	$ 0.64	$ 0.46	$ 0.59	$ 0.61	$ 0.37	$ 0.46	$ 0.36	$ 0.35	$ 2.29	$ 1.59	$ 1.49
Diluted (in dollars per share)	$ 0.63	$ 0.46	$ 0.58	$ 0.60	$ 0.36	$ 0.46	$ 0.35	$ 0.34	$ 2.26	$ 1.56	$ 1.46

Parent Company Financial Info_3

Parent Company Financial Information - STATEMENTS OF FINANCIAL CONDITION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Information Disclosure [Abstract]
Percentage of capital stock of the Bank held	100.00%
Assets
Cash and cash equivalents	$ 203,406	$ 197,164	$ 156,857	$ 78,417
Other assets	75,667	52,264
Total assets	11,487,387	8,024,501
Liabilities
Subordinated debentures	110,313	105,123
Accrued expenses and other liabilities	81,345	55,209
Total liabilities	9,517,690	6,782,505
Total Stockholders’ Equity	1,969,697	1,241,996	459,740	298,980
Total liabilities and stockholders’ equity	11,487,387	8,024,501
Corporation
Assets
Cash and cash equivalents	13,160	17,097	$ 15,124	$ 3,412
Investment in subsidiaries	2,068,077	1,329,961
Other assets	1,689	2,599
Total assets	2,082,926	1,349,657
Liabilities
Subordinated debentures	110,313	105,123
Accrued expenses and other liabilities	2,916	2,538
Total liabilities	113,229	107,661
Total Stockholders’ Equity	1,969,697	1,241,996
Total liabilities and stockholders’ equity	$ 2,082,926	$ 1,349,657

Parent Company Financial Info_4

Parent Company Financial Information - STATEMENTS OF OPERATIONS (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income
Interest income	$ 136,021	$ 128,876	$ 92,699	$ 90,827	$ 85,684	$ 70,161	$ 68,733	$ 45,427	$ 448,423	$ 270,005	$ 166,605
Noninterest income	6,970	8,240	8,151	7,666	9,451	8,221	8,759	4,683	31,027	31,114	19,602
Expense
Interest expense	18,475	16,163	11,528	9,546	7,514	5,870	5,395	3,724	55,712	22,503	13,530
Noninterest expense	67,239	82,782	50,076	49,808	49,886	39,612	48,455	30,005	249,905	167,958	98,063
Net income before income taxes									165,580	102,226	65,318
Income tax	15,376	7,798	10,182	8,884	19,370	10,619	7,521	4,616	42,240	42,126	25,215
Net income	$ 39,643	$ 28,392	$ 27,303	$ 28,002	$ 16,171	$ 20,232	$ 14,176	$ 9,521	123,340	60,100	40,103
Corporation
Income
Interest income									57	36	31
Noninterest income									0	0	0
Total income									57	36	31
Expense
Interest expense									6,715	4,720	3,844
Noninterest expense									6,139	8,956	3,769
Total expense									12,854	13,676	7,613
Net income before income taxes									(12,797)	(13,640)	(7,582)
Income tax									(3,678)	(5,417)	(2,785)
Net loss (parent only)									(9,119)	(8,223)	(4,797)
Equity in net earnings of subsidiaries									132,459	68,323	44,900
Net income									$ 123,340	$ 60,100	$ 40,103

Parent Company Financial Info_5

Parent Company Financial Information - SUMMARY STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	$ 39,643	$ 28,392	$ 27,303	$ 28,002	$ 16,171	$ 20,232	$ 14,176	$ 9,521	$ 123,340	$ 60,100	$ 40,103
Adjustments to reconcile net income to cash used in operating activities:
Share-based compensation expense									9,033	5,809	2,729
Increase (decrease) in accrued expenses and other liabilities									1,388	5,193	(4,948)
Net cash (used in) provided by operating activities									298,688	83,777	63,447
Cash flows from financing activities:
Restricted stock surrendered and canceled									(1,669)	(1,258)	(126)
Proceeds from issuance of subordinated debentures									0	12,012	0
Net cash (used in) provided by financing activities									(52,756)	255,105	445,908
Net change in cash and cash equivalents									6,242	40,307	78,440
Cash and cash equivalents, beginning of year				197,164				156,857	197,164	156,857	78,417
Cash and cash equivalents, end of year	203,406				197,164				203,406	197,164	156,857
Corporation
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income									123,340	60,100	40,103
Adjustments to reconcile net income to cash used in operating activities:
Share-based compensation expense									9,033	5,809	2,729
Equity in undistributed earnings of subsidiaries and dividends from the bank									(132,459)	(68,323)	(44,901)
Increase (decrease) in accrued expenses and other liabilities									6,464	(365)	240
(Decrease) increase in current and deferred taxes									(3,682)	(896)	0
Decrease (increase) in other assets									(6,888)	1,714	4,794
Net cash (used in) provided by operating activities									(4,192)	(1,961)	2,965
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance cost									0	0	0
Restricted stock surrendered and canceled									(1,669)	(1,258)	(125)
Proceeds from exercise of options and warrants									1,924	4,592	1,107
Capital contribution to Bank									0	600	7,765
Proceeds from issuance of subordinated debentures									0	0	0
Net cash (used in) provided by financing activities									255	3,934	8,747
Net change in cash and cash equivalents									(3,937)	1,973	11,712
Cash and cash equivalents, beginning of year				$ 17,097				$ 15,124	17,097	15,124	3,412
Cash and cash equivalents, end of year	$ 13,160				$ 17,097				$ 13,160	$ 17,097	$ 15,124

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details) $ / shares in Units, $ in Thousands	Jul. 01, 2018USD ($)$ / sharesshares	Nov. 01, 2017USD ($)$ / sharesshares	Apr. 02, 2017USD ($)shares	Jan. 31, 2016USD ($)shares	Dec. 31, 2018USD ($)	Dec. 31, 2018USD ($)	Nov. 01, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Jan. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Apr. 01, 2018USD ($)	Apr. 01, 2017USD ($)	Mar. 31, 2017$ / shares	Jan. 29, 2016USD ($)$ / shares	Dec. 31, 2015USD ($)
Business Acquisition [Line Items]
Goodwill acquired during the year						$ 313,043			$ 390,839		$ 51,658
Goodwill					$ 808,726	808,726			$ 493,329		$ 102,490					$ 50,832
Grandpoint Capital, Inc.
Business Acquisition [Line Items]
Total assets acquired	$ 3,051,567				3,075,820	3,075,820
Gross loans acquired	2,400,000
Deposits	$ 2,506,663				2,506,929	2,506,929
Equity issued (shares)	0.4750
Consideration paid	$ 601,200				602,152
Aggregate cash paid for shares and consideration payable	$ 28,100
Closing stock price of common stock (in dollars per share) | $ / shares	$ 38.15
Goodwill acquired during the year						313,000
Goodwill					313,043	313,043
Plaza Bancorp
Business Acquisition [Line Items]
Total assets acquired		$ 1,245,740					$ 1,254,730
Gross loans acquired		1,060,000
Deposits		$ 1,081,727					1,082,951
Equity issued (shares)		0.2
Consideration paid		$ 245,800					245,761
Aggregate cash paid for shares and consideration payable		$ 6,500
Number of shares of common stock issued as consideration | shares		6,049,373
Closing stock price of common stock (in dollars per share) | $ / shares		$ 40.4
Goodwill acquired during the year						1,800
Goodwill		$ 124,000					$ 123,640
Heritage Oaks Bank
Business Acquisition [Line Items]
Total assets acquired												$ 2,014,822	$ 2,003,635
Gross loans acquired													1,360,000
Deposits												1,669,550	$ 1,668,085
Equity issued (shares)													0.3471
Consideration paid			$ 467,400					$ 467,439
Aggregate cash paid for shares and consideration payable													$ 3,900
Closing stock price of common stock (in dollars per share) | $ / shares														$ 38.55
Goodwill acquired during the year						600
Goodwill												$ 269,553	$ 270,000
Security California Bancorp
Business Acquisition [Line Items]
Total assets acquired				$ 716,633						$ 713,950
Gross loans acquired				456,200
Deposits				$ 636,450	$ 636,600	$ 636,600				636,591
Equity issued (shares)				0.9629
Consideration paid				$ 120,200						120,174
Aggregate cash paid for shares and consideration payable				788
Closing stock price of common stock (in dollars per share) | $ / shares															$ 20.53
Goodwill				$ 51,700						$ 51,658
Common Stock | Grandpoint Capital, Inc.
Business Acquisition [Line Items]
Number of shares of common stock issued as consideration | shares	15,758,089
Common Stock | Heritage Oaks Bank
Business Acquisition [Line Items]
Number of shares of common stock issued as consideration | shares			11,959,022
Common Stock | Security California Bancorp
Business Acquisition [Line Items]
Number of shares of common stock issued as consideration | shares				5,815,051
Value of shares of common stock to be issued															$ 119,400

Acquisitions - Assets Acquired

Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jul. 01, 2018	Nov. 01, 2017	Apr. 02, 2017	Jan. 31, 2016	Dec. 31, 2018	Nov. 01, 2018	Mar. 31, 2018	Jan. 31, 2017	Apr. 01, 2018	Dec. 31, 2017	Apr. 01, 2017	Dec. 31, 2016	Dec. 31, 2015
LIABILITIES ASSUMED
Goodwill recognized					$ 808,726					$ 493,329		$ 102,490	$ 50,832
Grandpoint Capital, Inc.
ASSETS ACQUIRED
Cash and cash equivalents	$ 147,551				147,551
Investment securities	395,905				392,858
Loans, gross	2,404,042				2,352,717
Allowance for loan losses	(18,665)				0
Fixed assets	6,015				9,122
Core deposit intangible	5,093				71,943
Deferred tax assets	14,185				4,383
Other assets	97,441				97,246
Total assets acquired	3,051,567				3,075,820
LIABILITIES ASSUMED
Deposits	2,506,663				2,506,929
Borrowings	255,155				254,923
Other Liabilities	23,687				24,859
Total liabilities assumed	2,785,505				2,786,711
Excess of assets acquired over liabilities assumed	266,062				289,109
Consideration paid	$ 601,200				602,152
Goodwill recognized					313,043
Fair Value Adjustment
Cash and cash equivalents					0
Investment securities					(3,047)
Loans, gross					(51,325)
Allowance for loan losses					18,665
Fixed assets					3,107
Core deposit intangible					66,850
Deferred tax assets					(9,802)
Other assets					(195)
Total assets acquired					24,253
Deposits					266
Borrowings					(232)
Other Liabilities					1,172
Total liabilities assumed					1,206
Excess of assets acquired over liabilities assumed					23,047
Plaza Bancorp
ASSETS ACQUIRED
Cash and cash equivalents		$ 150,459				$ 150,459
Loans, gross		1,069,359				1,062,901
Allowance for loan losses		(13,009)				0
Fixed assets		7,389				5,965
Core deposit intangible		198				10,773
Deferred tax assets		11,849				5,726
Other assets		19,495				18,906
Total assets acquired		1,245,740				1,254,730
LIABILITIES ASSUMED
Deposits		1,081,727				1,082,951
Borrowings		40,755				41,152
Other Liabilities		8,956				8,506
Total liabilities assumed		1,131,438				1,132,609
Excess of assets acquired over liabilities assumed		114,302				122,121
Consideration paid		245,800				245,761
Goodwill recognized		$ 124,000				123,640
Fair Value Adjustment
Cash and cash equivalents						0
Loans, gross						(6,458)
Allowance for loan losses						13,009
Fixed assets						(1,424)
Core deposit intangible						10,575
Deferred tax assets						(6,123)
Other assets						(589)
Total assets acquired						8,990
Deposits						1,224
Borrowings						397
Other Liabilities						(450)
Total liabilities assumed						1,171
Excess of assets acquired over liabilities assumed						$ 7,819
Heritage Oaks Bank
ASSETS ACQUIRED
Cash and cash equivalents									$ 78,728		$ 78,728
Investment securities									442,923		445,299
Loans, gross									1,364,688		1,384,949
Allowance for loan losses									0		(17,200)
Fixed assets									34,902		35,567
Core deposit intangible									28,123		3,207
Deferred tax assets									10,244		17,850
Other assets									55,214		55,235
Total assets acquired									2,014,822		2,003,635
LIABILITIES ASSUMED
Deposits									1,669,550		1,668,085
Borrowings									139,034		139,150
Other Liabilities									8,352		8,059
Total liabilities assumed									1,816,936		1,815,294
Excess of assets acquired over liabilities assumed									197,886		188,341
Consideration paid			$ 467,400				$ 467,439
Goodwill recognized									$ 269,553		$ 270,000
Fair Value Adjustment
Cash and cash equivalents							0
Investment securities							(2,376)
Loans, gross							(20,261)
Allowance for loan losses							17,200
Fixed assets							(665)
Core deposit intangible							24,916
Deferred tax assets							(7,606)
Other assets							(21)
Total assets acquired							11,187
Deposits							1,465
Borrowings							(116)
Other Liabilities							293
Total liabilities assumed							1,642
Excess of assets acquired over liabilities assumed							$ 9,545
Security California Bancorp
ASSETS ACQUIRED
Cash and cash equivalents				$ 40,947				$ 40,947
Investment securities				191,881				190,254
Loans, gross				467,197				456,158
Allowance for loan losses				(7,399)				0
Fixed assets				5,335				4,190
Core deposit intangible				493				4,319
Deferred tax assets				5,618				6,748
Other assets				10,589				9,362
Total assets acquired				716,633				713,950
LIABILITIES ASSUMED
Deposits				636,450	$ 636,600			636,591
Borrowings				0				0
Deferred tax liability				0				0
Other Liabilities				9,063				8,843
Total liabilities assumed				645,513				645,434
Excess of assets acquired over liabilities assumed				71,120				68,516
Consideration paid				120,200				120,174
Goodwill recognized				51,700				51,658
Fair Value Adjustment
Cash and cash equivalents								0
Investment securities								(1,627)
Loans, gross								(11,039)
Allowance for loan losses								7,399
Fixed assets								(1,145)
Core deposit intangible								3,826
Deferred tax assets								1,130
Other assets								(1,227)
Total assets acquired								(2,683)
Deposits								141
Borrowings								0
Deferred tax liability								0
Other Liabilities								(220)
Total liabilities assumed								(79)
Excess of assets acquired over liabilities assumed								(2,604)
Security California Bancorp | Bank Time Deposits
ASSETS ACQUIRED
Cash and cash equivalents				$ 1,972				1,972
Fair Value Adjustment
Cash and cash equivalents								$ 0

Acquisitions - Additional infor

Acquisitions - Additional information (Details) - Acquired Loans $ in Thousands	Dec. 31, 2018USD ($)
Grandpoint Capital, Inc.
Business Acquisition [Line Items]
Contractual amounts due	$ 3,496,905
Cash flows not expected to be collected	39,071
Expected cash flows	3,457,834
Interest component of expected cash flows	1,105,117
Fair value of acquired loans	2,352,717
Plaza Bancorp
Business Acquisition [Line Items]
Contractual amounts due	1,708,685
Cash flows not expected to be collected	20,152
Expected cash flows	1,688,533
Interest component of expected cash flows	625,632
Fair value of acquired loans	1,062,901
Heritage Oaks Bank
Business Acquisition [Line Items]
Contractual amounts due	1,717,230
Cash flows not expected to be collected	4,442
Expected cash flows	1,712,788
Interest component of expected cash flows	348,100
Fair value of acquired loans	1,364,688
Security California Bancorp
Business Acquisition [Line Items]
Contractual amounts due	539,806
Cash flows not expected to be collected	2,765
Expected cash flows	537,041
Interest component of expected cash flows	80,883
Fair value of acquired loans	$ 456,158

Acquisitions - Pro Forma Inform

Acquisitions - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Combinations [Abstract]
Net interest and other income	$ 473,748	$ 465,400	$ 378,894
Net income	$ 133,565	$ 96,758	$ 104,908
Basic earnings per share (in dollars per share)	$ 2.16	$ 1.58	$ 1.71
Diluted earnings per share (in dollars per share)	$ 2.14	$ 1.56	$ 1.70

Subsequent Events (Details)

Subsequent Events (Details)	Jan. 28, 2019$ / shares
Subsequent Event
Subsequent Events
Cash dividend declared (usd per share)	$ 0.22