TriCo Bancshares (TCBK) 10-Q 9 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	May 06, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Entity Registrant Name	TRICO BANCSHARES /
Entity Central Index Key	0000356171
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Trading Symbol	TCBK
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		30,451,030

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets:
Cash and due from banks	$ 105,103	$ 119,781
Cash at Federal Reserve and other banks	213,605	107,752
Cash and cash equivalents	318,708	227,533
Investment securities:
Marketable equity securities	2,910	2,874
Available for sale debt securities	1,113,516	1,115,036
Held to maturity debt securities	431,016	444,936
Restricted equity securities	17,250	17,250
Loans held for sale	5,410	3,687
Loans	4,034,331	4,022,014
Allowance for loan losses	(32,064)	(32,582)
Total loans, net	4,002,267	3,989,432
Premises and equipment, net	89,275	89,347
Cash value of life insurance	117,841	117,318
Accrued interest receivable	20,431	19,412
Goodwill	220,972	220,972
Other intangible assets, net	27,849	29,280
Operating leases, right-of-use	30,942
Other assets	73,465	75,364
Total assets	6,471,852	6,352,441
Deposits:
Noninterest-bearing demand	1,761,559	1,760,580
Interest-bearing	3,668,703	3,605,886
Total deposits	5,430,262	5,366,466
Accrued interest payable	2,195	1,997
Operating lease liability	30,204
Other liabilities	86,362	83,724
Other borrowings	12,466	15,839
Junior subordinated debt	57,085	57,042
Total liabilities	5,618,574	5,525,068
Commitments and contingencies (Note 8)
Shareholders' equity:
Preferred stock, no par value: 1,000,000 shares authorized, zero issued and outstanding at March 31, 2019 and December 31, 2018	0
Common stock, no par value: 50,000,000 shares authorized; 30,432,419 and 30,417,223 issued and outstanding at March 31, 2019 and December 31, 2018, respectively	542,340	541,762
Retained earnings	319,865	303,490
Accumulated other comprehensive loss, net of tax	(8,927)	(17,879)
Total shareholders' equity	853,278	827,373
Total liabilities and shareholders' equity	$ 6,471,852	$ 6,352,441

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, no par value	$ 0	$ 0
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	30,432,419	30,417,223
Common stock, shares outstanding	30,432,419	30,417,223

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest and dividend income:
Loans, including fees	$ 54,398	$ 38,049
Investments:
Taxable securities	10,555	7,322
Tax exempt securities	1,073	1,041
Dividends	360	336
Interest bearing cash at Federal Reserve and other banks	1,071	373
Total interest and dividend income	67,457	47,121
Interest expense:
Deposits	2,719	1,096
Other borrowings	13	342
Junior subordinated debt	855	697
Total interest expense	3,587	2,135
Net interest income	63,870	44,986
Benefit from reversal of provision for loan losses	(1,600)	(236)
Net interest income after benefit from reversal of provision for loan losses	65,470	45,222
Noninterest income:
Service charges and fees	9,070	9,356
Gain on sale of loans	412	626
Asset management and commission income	642	876
Increase in cash value of life insurance	775	608
Other	965	824
Total noninterest income	11,864	12,290
Noninterest expense:
Salaries and related benefits	25,128	21,652
Other	20,385	16,510
Total noninterest expense	45,513	38,162
Income before provision for income taxes	31,821	19,350
Provision for income taxes	9,095	5,440
Net income	$ 22,726	$ 13,910
Earnings per share:
Basic	$ 0.75	$ 0.61
Diluted	$ 0.74	$ 0.60

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 22,726	$ 13,910
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on available for sale securities arising during the period	8,952	(11,026)
Change in minimum pension liability		80
Other comprehensive income (loss)	8,952	(10,946)
Comprehensive income	$ 31,678	$ 2,964

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2017	$ 505,808	$ 255,836	$ 255,200	$ (5,228)
Beginning balance, shares at Dec. 31, 2017		22,955,963
Net income	13,910		13,910
Adoption ASU | ASU 2016-01 [Member]			(62)	62
Adoption ASU | ASU 2018-02 [Member]			1,093	(1,093)
Other comprehensive income (loss)	(10,946)			(10,946)
Stock option vesting	37	$ 37
RSU vesting	238	238
PSU vesting, value	116	$ 116
RSUs released, shares		494
Repurchase of common stock, value	(4)	$ (1)	(3)
Repurchase of common stock, shares		(134)
Dividends paid	(3,903)		(3,903)
Ending balance at Mar. 31, 2018	505,256	$ 256,226	266,235	(17,205)
Ending balance, shares at Mar. 31, 2018		22,956,323
Beginning balance at Dec. 31, 2018	$ 827,373	$ 541,762	303,490	(17,879)
Beginning balance, shares at Dec. 31, 2018	30,417,223	30,417,223
Net income	$ 22,726		22,726
Other comprehensive income (loss)	8,952			8,952
Stock options exercised	$ 647	$ 647
Stock options exercised, shares	41,000	41,000
RSU vesting	$ 278	$ 278
PSU vesting, value	119	$ 119
RSUs released, shares		355
Repurchase of common stock, value	(1,035)	$ (466)	(569)
Repurchase of common stock, shares		(26,159)
Dividends paid	(5,782)		(5,782)
Ending balance at Mar. 31, 2019	$ 853,278	$ 542,340	$ 319,865	$ (8,927)
Ending balance, shares at Mar. 31, 2019	30,432,419	30,432,419

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Retained Earnings [Member]
Dividends paid, per share	$ 0.19	$ 0.17

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities:
Net income	$ 22,726	$ 13,910
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment, and amortization	1,838	1,613
Amortization of intangible assets	1,431	339
Reversal of provision for loan losses	(1,600)	(236)
Amortization of investment securities premium, net	571	700
Originations of loans for resale	(18,119)	(20,332)
Proceeds from sale of loans originated for resale	16,689	23,270
Gain on sale of loans	(412)	(626)
Change in market value of mortgage servicing rights	645	(111)
Provision for losses on foreclosed assets	0	90
Gain on transfer of loans to foreclosed assets	(98)
Gain on sale of foreclosed assets	(99)	(371)
Loss on disposal of fixed assets	38	13
Increase in cash value of life insurance	(775)	(608)
Gain on life insurance death benefit	(32)
(Gain) loss on marketable equity securities	(36)	48
Equity compensation vesting expense	397	391
Change in:
Interest receivable	(1,019)	1,365
Interest payable	198	28
Other assets and liabilities, net	(288)	4,231
Net cash from operating activities	22,055	23,714
Investing activities:
Proceeds from maturities of securities available for sale	15,133	15,643
Proceeds from maturities of securities held to maturity	13,684	18,535
Purchases of securities available for sale	(1,238)	(39,647)
Loan origination and principal collections, net	(11,351)	(54,682)
Proceeds from sale of other real estate owned	278	1,943
Proceeds from sale of premises and equipment	11
Purchases of premises and equipment	(1,650)	(2,200)
Net cash from investing activities	14,867	(60,408)
Financing activities:
Net increase in deposits	63,796	75,273
Net change in other borrowings	(3,373)	(57,125)
Repurchase of common stock, net	(388)
Dividends paid	(5,782)	(3,903)
Net cash used by financing activities	54,253	14,245
Net change in cash and cash equivalents	91,175	(22,449)
Cash and cash equivalents and beginning of year	227,533	205,428
Cash and cash equivalents at end of year	318,708	182,979
Supplemental disclosure of noncash activities:
Unrealized gain (loss) on securities available for sale	12,710	(15,628)
Loans transferred to foreclosed assets	116
Market value of shares tendered in-lieu of cash to pay for exercise of options and/or related taxes	647	4
Supplemental disclosure of cash flow activity:
Cash paid for interest expense	3,389	2,107
Cash paid for income taxes	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1 –Summary of Significant Accounting Policies Description of Business and Basis of Presentation TriCo Bancshares (the “Company” or “we”) is a California corporation organized to act as a bank holding company for Tri Counties Bank (the “Bank”). The Company and the Bank are headquartered in Chico, California. The Bank is a California-chartered bank that is engaged in the general commercial banking business in 29 California counties. The Company has five capital subsidiary business trusts (collectively, the “Capital Trusts”) that issued trust preferred securities, including two organized by the Company and three acquired with the acquisition of North Valley Bancorp. The consolidated financial statements are prepared in accordance with accounting policies generally accepted in the United States of America and general practices in the banking industry. All adjustments necessary for a fair presentation of these consolidated financial statements have been included and are of a normal and recurring nature. The financial statements include the accounts of the Company. All inter-company accounts and transactions have been eliminated in consolidation. For financial reporting purposes, the Company’s investments in the Capital Trusts of $1,714,000 are accounted for under the equity method and, accordingly, are not consolidated and are included in other assets on the consolidated balance sheet. The subordinated debentures issued and guaranteed by the Company and held by the Capital Trusts are reflected as debt on the Company’s consolidated balance sheet. Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America 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 and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission. These unaudited condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 (the “2018 Annual Report”). The Company believes that the disclosures made are adequate to make the information not misleading. Segment and Significant Group Concentration of Credit Risk The Company grants agribusiness, commercial, consumer, and residential loans to customers located throughout northern and central California. The Company has a diversified loan portfolio within the business segments located in this geographical area. The Company currently classifies all its operation into one business segment that it denotes as community banking. Geographical Descriptions For the purpose of describing the geographical location of the Company’s operations, the Company has defined northern California as that area of California north of, and including, Stockton to the east and San Jose to the west; central California as that area of the state south of Stockton and San Jose, to and including, Bakersfield to the east and San Luis Obispo to the west; and southern California as that area of the state south of Bakersfield and San Luis Obispo. Cash and Cash Equivalents Net cash flows are reported for loan and deposit transactions and other borrowings. For purposes of the consolidated statement of cash flows, cash, due from banks with original maturities less than 90 days, interest-earning deposits in other banks, and Federal funds sold are considered to be cash equivalents. Accounting Standards Adopted in 2019 The Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-02, Leases (Topic 842) The FASB issued ASU 2017-08, Receivables—Nonrefundable Fees and Other Costs (Topic 310). ASU 2017-08 shortens the amortization period for certain callable debt securities held at a premium to require such premiums to be amortized to the earliest call date unless applicable guidance related to certain pools of securities is applied to consider estimated prepayments. Under prior guidance, entities were generally required to amortize premiums on individual, non-pooled callable debt securities as a yield adjustment over the contractual life of the security. ASU 2017-08 does not change the accounting for callable debt securities held at a discount. ASU 2017-08 was effective for the Company on January 1, 2019, and did not have an impact on the Company’s consolidated financial statements. Accounting Standards Pending Adoption The FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326) FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other: Simplifying the Test for Goodwill Impairment (Topic 350): ASU 2017-04 eliminates step two of the goodwill impairment test (the hypothetical purchase price allocation used to determine the implied fair value of goodwill) when step one (determining if the carrying value of a reporting unit exceeds its fair value) is failed. Instead, entities simply will compare the fair value of a reporting unit to its carrying amount and record goodwill impairment for the amount by which the reporting unit’s carrying amount exceeds its fair value. ASU 2017-04 will be effective for the Company on January 1, 2020 and is not expected to have a significant impact on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, “Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement.” This ASU eliminates, adds and modifies certain disclosure requirements for fair value measurements. Among the changes, entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. ASU No. 2018-13 is effective for interim and annual reporting periods beginning after December 15, 2019; early adoption is permitted. Entities are also allowed to elect early adoption the eliminated or modified disclosure requirements and delay adoption of the new disclosure requirements until their effective date. As ASU No. 2018-13 only revises disclosure requirements, it will not have a significant impact on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-14, “Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans

Business Combinations

Business Combinations	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Business Combinations	Note 2—Business Combinations Merger with FNB Bancorp On July 6, 2018, the Company completed the acquisition of FNB Bancorp (“FNBB”) for an aggregate transaction value of $291,132,000. FNBB was merged into the Company, and the Company issued 7,405,277 shares of common stock to the former shareholders of FNBB. FNBB’s subsidiary, First National Bank of Northern California, merged into the Bank on the same day. The Company also paid $6.7 million to settle and retire all FNBB stock options outstanding as of the acquisition date. Upon the consummation of the merger, the Company added 12 branches within San Mateo, San Francisco, and Santa Clara counties. In accordance with accounting for business combinations, the Company recorded $156,661,000 of goodwill and $27,605,000 of core deposit intangibles on the acquisition date. The core deposit intangibles will be amortized over the weighted average remaining life of 6.2 years with no significant residual value. For tax purposes, purchase prices accounting adjustments including goodwill are all non-taxable and /or non-deductible. Acquisition related costs of $476,000 are included in the consolidated statements of income for the three months ended March 31, 2018. There have been no acquisition costs incurred during the three months ended March 31, 2019. The acquisition was consistent with the Company’s strategy to expand into the Bay Area market. The acquisition offers the Company the opportunity to increase profitability by introducing existing products and services to the acquired customer base as well as add new customers in the expanded region. Goodwill arising from the acquisition consisted largely of the estimated cost savings resulting from the combined operations. The following table summarizes the consideration paid for FNBB and the amounts of assets acquired and liabilities assumed that were recorded at the acquisition date (in thousands). FNB Bancorp July 6, 2018 Fair value of consideration transferred: Fair value of shares issued $ 284,437 Cash consideration 6,695 Total fair value of consideration transferred 291,132 Assets acquired: Cash and cash equivalents 37,308 Securities available for sale 335,667 Restricted equity securities 7,723 Loans 834,683 Premises and equipment 30,522 Cash value of life insurance 16,817 Core deposit intangible 27,605 Other assets 16,214 Total assets acquired 1,306,539 Liabilities assumed: Deposits 991,935 Other liabilities 15,133 Short-term borrowings—Federal Home Loan Bank 165,000 Total liabilities assumed 1,172,068 Total net assets acquired 134,471 Goodwill recognized $ 156,661 A summary of the estimated fair value adjustments resulting in the goodwill recorded in the FNB Bancorp acquisition are presented below (in thousands): FNB Bancorp July 6, 2018 Value of stock consideration paid to FNB Bancorp Shareholders $ 284,437 Cash consideration 6,695 Less: Cost basis net assets acquired 114,030 Fair value adjustments: Investments (1,081 ) Loans (22,390 ) Premises and Equipment 21,590 Core deposit intangible 27,327 Deferred income taxes (6,394 ) Other 1,389 Goodwill $ 156,661 The fair value of net assets acquired includes fair value adjustments to certain loans that were not considered impaired (PNCI loans) as of the acquisition date. The fair value adjustments were determined using discounted contractual cash flows. As such, these loans were not considered impaired at the acquisition date and were not subject to the guidance relating to purchased credit impaired loans (PCI loans), which have shown evidence of credit deterioration since origination. The gross contractual amounts receivable and fair value for PNCI loans as of the acquisition date was $866,189,000 and $833,381,000, respectively. The gross contractual amounts receivable and fair value for PCI loans as of the acquisition date was $1,683,000 and $1,302,000, respectively. At the acquisition date, the Company was unable to estimate the expected contractual cash flows to be collected from the purchased credit impaired loans.

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2019
Investments Schedule [Abstract]
Investment Securities	Note 3—Investment Securities The amortized cost and estimated fair values of investments in debt securities are summarized in the following tables: March 31, 2019 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 631,914 $ 1,862 $ (6,676 ) $ 627,100 Obligations of states and political subdivisions 128,706 1,242 (599 ) 129,349 Corporate bonds 4,394 84 — 4,478 Asset backed securities 356,766 141 (4,318 ) 352,589 Total debt securities available for sale $ 1,121,780 $ 3,329 $ (11,593 ) $ 1,113,516 Debt Securities Held to Maturity Obligations of U.S. government agencies $ 416,418 $ 2,190 $ (2,581 ) $ 416,027 Obligations of states and political subdivisions 14,598 173 (25 ) 14,746 Total debt securities held to maturity $ 431,016 $ 2,363 $ (2,606 ) $ 430,773 December 31, 2018 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 647,288 $ 771 $ (18,078 ) $ 629,981 Obligations of states and political subdivisions 128,890 294 (3,112 ) 126,072 Corporate bonds 4,381 97 — 4,478 Asset backed securities 355,451 73 (1,019 ) 354,505 Total debt securities available for sale $ 1,136,010 $ 1,235 $ (22,209 ) $ 1,115,036 Debt Securities Held to Maturity Obligations of U.S. government agencies $ 430,343 $ 327 $ (7,745 ) $ 422,925 Obligations of states and political subdivisions 14,593 82 (230 ) 14,445 Total debt securities held to maturity $ 444,936 $ 409 $ (7,975 ) $ 437,370 There were no sales of investment securities during the three months ended March 31, 2019 and 2018. Investment securities with an aggregate carrying value of $587,233,000 and $597,591,000 at March 31, 2019 and December 31, 2018, respectively, were pledged as collateral for specific borrowings, lines of credit or local agency deposits. The amortized cost and estimated fair value of debt securities at March 31, 2019 by contractual maturity are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. At March 31, 2019, obligations of U.S. government corporations and agencies with a cost basis totaling $1,048,332,000 consist almost entirely of residential real estate mortgage-backed securities whose contractual maturity, or principal repayment, will follow the repayment of the underlying mortgages. For purposes of the following table, the entire outstanding balance of these mortgage-backed securities issued by U.S. government corporations and agencies is categorized based on final maturity date. At March 31, 2019, the Company estimates the average remaining life of these mortgage-backed securities issued by U.S. government corporations and agencies to be approximately 5.5 years. Average remaining life is defined as the time span after which the principal balance has been reduced by half. Debt Securities Available for Sale Held to Maturity (In thousands) Amortized Estimated Amortized Estimated Cost Fair Value Cost Fair Value Due in one year $ 2,413 $ 2,418 $ — $ — Due after one year through five years 10,584 10,798 1,246 1,260 Due after five years through ten years 18,130 18,624 23,944 23,899 Due after ten years 1,090,653 1,081,676 405,826 405,614 Totals $ 1,121,780 $ 1,113,516 $ 431,016 $ 430,773 Gross unrealized losses on debt securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows: Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Value Loss Value Loss Value Loss March 31, 2019 (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 481 $ (2 ) $ 496,424 $ (6,674 ) $ 496,905 $ (6,676 ) Obligations of states and political subdivisions 24,644 (598 ) 566 (1 ) 25,210 (599 ) Asset backed securities 330,078 (4,318 ) — — 330,078 (4,318 ) Total debt securities available for sale $ 355,203 $ (4,918 ) $ 496,990 $ (6,675 ) $ 852,193 $ (11,593 ) Debt Securities Held to Maturity Obligations of U.S. government agencies $ — $ — $ 224,551 $ (2,581 ) $ 224,551 $ (2,581 ) Obligations of states and political subdivisions — — 5,891 (25 ) 5,891 (25 ) Total debt securities held to maturity $ — $ — $ 230,442 $ (2,606 ) $ 230,442 $ (2,606 ) Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Value Loss Value Loss Value Loss December 31, 2018 (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 171,309 $ (3,588 ) $ 394,630 $ (14,490 ) $ 565,939 $ (18,078 ) Obligations of states and political subdivisions 63,738 (1,541 ) 20,719 (1,571 ) 84,457 (3,112 ) Asset backed securities 101,386 (1,019 ) — — 101,386 (1,019 ) Total debt securities available for sale $ 336,433 $ (6,148 ) $ 415,349 $ (16,061 ) $ 751,782 $ (22,209 ) Debt Securities Held to Maturity Obligations of U.S. government agencies $ 223,810 $ (2,619 ) $ 158,648 $ (5,126 ) $ 382,458 $ (7,745 ) Obligations of states and political subdivisions 5,786 (114 ) 4,042 (116 ) 9,828 (230 ) Total debt securities held to maturity $ 229,596 $ (2,733 ) $ 162,690 $ (5,242 ) $ 392,286 $ (7,975 ) Obligations of U.S. government agencies: Unrealized losses on investments in obligations of U.S. government agencies are caused by interest rate increases. The contractual cash flows of these securities are guaranteed by U.S. Government Sponsored Entities (principally Fannie Mae and Freddie Mac). It is expected that the securities would not be settled at a price less than the amortized cost of the investment. Because the decline in fair value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell and more likely than not will not be required to sell, these investments are not considered other-than-temporarily impaired. At March 31, 2019, 93 (1.3 Obligations of states and political subdivisions: The unrealized losses on investments in obligations of states and political subdivisions were caused by increases in required yields by investors in these types of securities. It is expected that the securities would not be settled at a price less than the amortized cost of the investment. Because the decline in fair value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell and more likely than not will not be required to sell, these investments are not considered other-than-temporarily impaired. At March 31, 2019, 33 (2.0 Asset backed securities: The unrealized losses on investments in asset backed securities were caused by increases in required yields by investors in these types of securities. At the time of purchase, each of these securities was rated AA or AAA and through March 31, 2019 has not experienced any deterioration in credit rating. The Company continues to monitor these securities for changes in credit rating or other indications of credit deterioration. Because management believes the decline in fair value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell and more likely than not will not be required to sell, these investments are not considered other-than-temporarily impaired. At March 31, 2019, 28 (1.3 Marketable equity securities: All unrealized losses recognized during the reporting period were for equity securities still held at March 31, 2019.

Loans

Loans	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Loans	Note 4 – Loans A summary of loan balances follows (in thousands): March 31, 2019 Originated PNCI PCI Total Mortgage loans on real estate: Residential 1-4 family $ 357,559 $ 163,268 $ 1,585 $ 522,412 Commercial 1,929,508 671,397 6,022 2,606,927 Total mortgage loan on real estate 2,287,067 834,665 7,607 3,129,339 Consumer: Home equity lines of credit 279,075 38,090 1,088 318,253 Home equity loans 31,245 3,356 436 35,037 Other 45,020 20,001 41 65,062 Total consumer loans 355,340 61,447 1,565 418,352 Commercial 227,314 39,295 2,554 269,163 Construction: Residential 115,688 30,096 — 145,784 Commercial 64,576 7,117 — 71,693 Total construction 180,264 37,213 — 217,477 Total loans, net of deferred loan fees and discounts $ 3,049,985 $ 972,620 $ 11,726 $ 4,034,331 Total principal balance of loans owed, net of charge-offs $ 3,059,398 $ 1,007,678 $ 18,376 $ 4,085,452 Unamortized net deferred loan fees (9,413 ) — — (9,413 ) Discounts to principal balance of loans owed, net of charge-offs — (35,058 ) (6,650 ) (41,708 ) Total loans, net of unamortized deferred loan fees and discounts $ 3,049,985 $ 972,620 $ 11,726 $ 4,034,331 Allowance for loan losses $ (31,088 ) $ (969 ) $ (7 ) $ (32,064 ) December 31, 2018 Originated PNCI PCI Total Mortgage loans on real estate: Residential 1-4 family $ 343,796 $ 169,792 $ 1,674 $ 515,262 Commercial 1,910,981 708,401 8,456 2,627,838 Total mortgage loan on real estate 2,254,777 878,193 10,130 3,143,100 Consumer: Home equity lines of credit 284,453 40,957 1,167 326,577 Home equity loans 32,660 3,585 439 36,684 Other 34,020 21,659 42 55,721 Total consumer loans 351,133 66,201 1,648 418,982 Commercial 228,635 45,468 2,445 276,548 Construction: Residential 90,703 30,593 — 121,296 Commercial 56,208 5,880 — 62,088 Total construction 146,911 36,473 — 183,384 Total loans, net of deferred loan fees and discounts $ 2,981,456 $ 1,026,335 $ 14,223 $ 4,022,014 Total principal balance of loans owed, net of charge-offs $ 2,991,324 $ 1,062,655 $ 21,265 $ 4,075,244 Unamortized net deferred loan fees (9,868 ) — — (9,868 ) Discounts to principal balance of loans owed, net of charge-offs — (36,320 ) (7,042 ) (43,362 ) Total loans, net of unamortized deferred loan fees and discounts $ 2,981,456 $ 1,026,335 $ 14,223 $ 4,022,014 Allowance for loan losses $ (31,793 ) $ (667 ) $ (122 ) $ (32,582 ) The following is a summary of the change in accretable yield for PCI during the periods indicated (in thousands): Three months ended March 31, 2019 2018 Change in accretable yield: Balance at beginning of period $ 6,059 $ 6,137 Accretion to interest income (301 ) (255 ) Reclassification (to) from nonaccretable difference (11 ) 140 Balance at end of period $ 5,747 $ 6,022

Allowance for Loan Losses

Allowance for Loan Losses	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Allowance for Loan Losses	Note 5 – Allowance for Loan Losses The following tables summarize the activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated. Allowance for Loan Losses – Three Months Ended March 31, 2019 (in thousands) Beginning Balance Charge-offs Recoveries Provision (benefit) Ending Balance Mortgage loans on real estate: Residential 1-4 family $ 2,676 $ — $ 2 $ (178 ) $ 2,500 Commercial 12,944 — 1,381 (1,995 ) 12,330 Total mortgage loans on real estate 15,620 — 1,383 (2,173 ) 14,830 Consumer: Home equity lines of credit 6,042 — 95 (122 ) 6,015 Home equity loans 1,540 — 87 (341 ) 1,286 Other 793 (207 ) 75 379 1,040 Total consumer loans 8,375 (207 ) 257 (84 ) 8,341 Commercial 6,090 (519 ) 168 339 6,078 Construction: Residential 1,834 — — 574 2,408 Commercial 663 — — (256 ) 407 Total construction 2,497 — — 318 2,815 Total $ 32,582 $ (726 ) $ 1,808 $ (1,600 ) $ 32,064 Allowance for Loan Losses – As of March 31, 2019 (in thousands) Loans pooled for evaluation Individually evaluated for impairment Loans acquired with deteriorated credit quality Total allowance for loan losses Mortgage loans on real estate: Residential 1-4 family $ 2,445 $ 55 $ — $ 2,500 Commercial 12,293 36 1 12,330 Total mortgage loans on real estate 14,738 91 1 14,830 Consumer: Home equity lines of credit 5,879 130 6 6,015 Home equity loans 1,216 70 — 1,286 Other 1,023 17 — 1,040 Total consumer loans 8,118 217 6 8,341 Commercial 4,636 1,442 — 6,078 Construction: Residential 2,408 — — 2,408 Commercial 407 — — 407 Total construction 2,815 — — 2,815 Total $ 30,307 $ 1,750 $ 7 $ 32,064 Loans, Net of Unearned fees – As of March 31, 2019 (in thousands) Loans pooled for evaluation Individually evaluated for impairment Loans acquired with deteriorated credit quality Total loans, net of unearned fees Mortgage loans on real estate: Residential 1-4 family $ 517,038 $ 3,789 $ 1,585 $ 522,412 Commercial 2,592,994 7,911 6,022 2,606,927 Total mortgage loans on real estate 3,110,032 11,700 7,607 3,129,339 Consumer: Home equity lines of credit 314,609 2,556 1,088 318,253 Home equity loans 32,618 1,983 436 35,037 Other 64,891 130 41 65,062 Total consumer loans 412,118 4,669 1,565 418,352 Commercial 261,933 4,676 2,554 269,163 Construction: Residential 145,784 — — 145,784 Commercial 71,693 — — 71,693 Total construction 217,477 — — 217,477 Total $ 4,001,560 $ 21,045 $ 11,726 $ 4,034,331 Allowance for Loan Losses – Year Ended December 31, 2018 (in thousands) Beginning Charge-offs Recoveries Provision Ending Mortgage loans on real estate: Residential 1-4 family $ 2,317 $ (77 ) $ — $ 436 $ 2,676 Commercial 11,441 (15 ) 68 1,450 12,944 Total mortgage loans on real estate 13,758 (92 ) 68 1,886 15,620 Consumer: Home equity lines of credit 5,800 (277 ) 846 (327 ) 6,042 Home equity loans 1,841 (24 ) 297 (574 ) 1,540 Other 586 (783 ) 288 702 793 Total consumer loans 8,227 (1,084 ) 1,431 (199 ) 8,375 Commercial 6,512 (1,188 ) 541 225 6,090 Construction: Residential 1,184 — — 650 1,834 Commercial 642 — — 21 663 Total construction 1,826 — — 671 2,497 Total $ 30,323 $ (2,364 ) $ 2,040 $ 2,583 $ 32,582 Allowance for Loan Losses – As of December 31, 2018 (in thousands) Loans pooled Individually Loans acquired Total allowance Mortgage loans on real estate: Residential 1-4 family $ 2,620 $ 56 $ — $ 2,676 Commercial 12,737 91 116 12,944 Total mortgage loans on real estate 15,357 147 116 15,620 Consumer: Home equity lines of credit 5,838 198 6 6,042 Home equity loans 1,486 54 — 1,540 Other 779 14 — 793 Total consumer loans 8,103 266 6 8,375 Commercial 4,309 1,781 — 6,090 Construction: Residential 1,834 — — 1,834 Commercial 663 — — 663 Total construction 2,497 — — 2,497 Total $ 30,266 $ 2,194 $ 122 $ 32,582 Loans, Net of Unearned fees – As of December 31, 2018 (in thousands) Loans pooled for evaluation Individually evaluated for impairment Loans acquired with deteriorated credit quality Total loans, net of unearned fees Mortgage loans on real estate: Residential 1-4 family $ 509,267 $ 4,321 $ 1,674 $ 515,262 Commercial 2,606,819 12,563 8,456 2,627,838 Total mortgage loans on real estate 3,116,086 16,884 10,130 3,143,100 Consumer: Home equity lines of credit 322,764 2,646 1,167 326,577 Home equity loans 33,142 3,103 439 36,684 Other 55,483 196 42 55,721 Total consumer loans 411,389 5,945 1,648 418,982 Commercial 268,885 5,218 2,445 276,548 Construction: Residential 121,296 — — 121,296 Commercial 62,088 — — 62,088 Total construction 183,384 — — 183,384 Total $ 3,979,744 $ 28,047 $ 14,223 $ 4,022,014 Allowance for Loan Losses – Three Months Ended March 31, 2018 (in thousands) Beginning Charge-offs Recoveries Provision Ending Balance Mortgage loans on real estate: Residential 1-4 family $ 2,317 $ (1 ) $ — $ (146 ) $ 2,170 Commercial 11,441 — 15 39 11,495 Total mortgage loans on real estate 13,758 (1 ) 15 (107 ) 13,665 Consumer: Home equity lines of credit 5,800 (80 ) 209 (517 ) 5,412 Home equity loans 1,841 — 14 (119 ) 1,736 Other 586 (194 ) 78 100 570 Total consumer loans 8,227 (274 ) 301 (536 ) 7,718 Commercial 6,512 (205 ) 50 35 6,392 Construction: Residential 1,184 — — 167 1,351 Commercial 642 — — 205 847 Total construction 1,826 — — 372 2,198 Total $ 30,323 $ (480 ) $ 366 $ (236 ) $ 29,973 Allowance for Loan Losses – As of March 31, 2018 (in thousands) Loans pooled for evaluation Individually evaluated for impairment Loans acquired with deteriorated credit quality Total allowance for loan losses Mortgage loans on real estate: Residential 1-4 family $ 1,910 $ 190 $ 70 $ 2,170 Commercial 11,281 154 60 11,495 Total mortgage loans on real estate 13,191 344 130 13,665 Consumer: Home equity lines of credit 4,956 448 8 5,412 Home equity loans 1,606 130 — 1,736 Other 514 56 — 570 Total consumer loans 7,076 634 8 7,718 Commercial 4,249 2,113 30 6,392 Construction: Residential 1,351 — — 1,351 Commercial 847 — — 847 Total construction 2,198 — — 2,198 Total $ 26,714 $ 3,091 $ 168 $ 29,973 Loans, Net of Unearned fees – As of March 31, 2018 (in thousands) Loans pooled for evaluation Individually evaluated for impairment Loans acquired with deteriorated credit quality Total loans, net Mortgage loans on real estate: Residential 1-4 family $ 378,832 $ 5,535 $ 1,744 $ 386,111 Commercial 1,954,120 11,110 8,038 1,973,268 Total mortgage loans on real estate 2,332,952 16,645 9,782 2,359,379 Consumer: Home equity lines of credit 279,140 2,450 1,661 283,251 Home equity loans 39,774 1,673 485 41,932 Other 23,285 278 43 23,606 Total consumer loans 342,199 4,401 2,189 348,789 Commercial 208,889 4,621 2,505 216,015 Construction: Residential 71,462 136 — 71,598 Commercial 73,952 — — 73,952 Total construction 145,414 136 — 145,550 Total $ 3,029,454 $ 25,803 $ 14,476 $ 3,069,733 As part of the on-going monitoring of the credit quality of the Company’s loan portfolio, management tracks certain credit quality indicators including, but not limited to, trends relating to (i) the level of criticized and classified loans, (ii) net charge-offs, (iii) non-performing loans, and (iv) delinquency within the portfolio. The Company utilizes a risk grading system to assign a risk grade to each of its loans. Loans are graded on a scale ranging from Pass to Loss. A description of the general characteristics of the risk grades is as follows: • Pass • Special Mention • Substandard • Doubtful • Loss The following tables present ending loan balances by loan category and risk grade for the periods indicated: Credit Quality Indicators Originated Loans– As of March 31, 2019 (in thousands) Pass Special Mention Substandard Doubtful / Loss Total Originated Loans Mortgage loans on real estate: Residential 1-4 family $ 350,256 $ 1,807 $ 5,496 $ — $ 357,559 Commercial 1,886,958 33,094 9,456 — 1,929,508 Total mortgage loans on real estate 2,237,214 34,901 14,952 — 2,287,067 Consumer: Home equity lines of credit 273,144 2,867 3,064 — 279,075 Home equity loans 27,328 1,533 2,384 — 31,245 Other 44,611 309 100 — 45,020 Total consumer loans 345,083 4,709 5,548 — 355,340 Commercial 214,758 7,896 4,660 — 227,314 Construction: Residential 115,432 — 256 — 115,688 Commercial 64,238 338 — — 64,576 Total construction 179,670 338 256 — 180,264 Total loans $ 2,976,725 $ 47,844 $ 25,416 $ — $ 3,049,985 Credit Quality Indicators PNCI Loans – As of March 31, 2019 (in thousands) Pass Special Mention Substandard Doubtful / Loss Total PNCI Loans Mortgage loans on real estate: Residential 1-4 family $ 161,351 $ 1,109 $ 808 $ — $ 163,268 Commercial 665,630 2,727 3,040 — 671,397 Total mortgage loans on real estate 826,981 3,836 3,848 — 834,665 Consumer: Home equity lines of credit 35,888 925 1,277 — 38,090 Home equity loans 3,174 98 84 — 3,356 Other 19,790 208 3 — 20,001 Total consumer loans 58,852 1,231 1,364 — 61,447 Commercial 38,762 201 332 — 39,295 Construction: Residential 30,096 — — — 30,096 Commercial 6,872 — 245 — 7,117 Total construction 36,968 — 245 — 37,213 Total loans $ 961,563 $ 5,268 $ 5,789 $ — $ 972,620 Credit Quality Indicators Originated Loans– As of December 31, 2018 (in thousands) Pass Special Mention Substandard Doubtful / Loss Total Originated Loans Mortgage loans on real estate: Residential 1-4 family $ 337,189 $ 1,724 $ 4,883 $ — $ 343,796 Commercial 1,861,627 33,483 15,871 — 1,910,981 Total mortgage loans on real estate 2,198,816 35,207 20,754 — 2,254,777 Consumer: Home equity lines of credit 279,491 2,309 2,653 — 284,453 Home equity loans 29,289 1,054 2,317 — 32,660 Other 33,606 341 73 — 34,020 Total consumer loans 342,386 3,704 5,043 — 351,133 Commercial 217,126 6,127 5,382 — 228,635 Construction: Residential 90,412 32 259 — 90,703 Commercial 55,863 345 — — 56,208 Total construction 146,275 377 259 — 146,911 Total loans $ 2,904,603 $ 45,415 $ 31,438 $ — $ 2,981,456 Credit Quality Indicators PNCI Loans – As of December 31, 2018 (in thousands) Pass Special Mention Substandard Doubtful / Loss Total PNCI Loans Mortgage loans on real estate: Residential 1-4 family $ 167,908 $ 1,086 $ 798 $ — $ 169,792 Commercial 701,868 3,085 3,448 — 708,401 Total mortgage loans on real estate 869,776 4,171 4,246 — 878,193 Consumer: Home equity lines of credit 38,780 1,124 1,053 — 40,957 Home equity loans 3,413 74 98 — 3,585 Other 21,481 173 5 — 21,659 Total consumer loans 63,674 1,371 1,156 — 66,201 Commercial 45,027 321 120 — 45,468 Construction: Residential 30,593 — — — 30,593 Commercial 5,880 — — — 5,880 Total construction 36,473 — — — 36,473 Total $ 1,014,950 $ 5,863 $ 5,522 $ — $ 1,026,335 Consumer loans, whether unsecured or secured by real estate, automobiles, or other personal property, are susceptible to three primary risks; non-payment due to income loss, over-extension of credit and, when the borrower is unable to pay, shortfall in collateral value. Typically, payment performance will follow general economic trends in the marketplace driven primarily by rises in the unemployment rate; non-payment is likely due to loss of employment. Loss of collateral value can be due to market demand shifts, damage to collateral itself or a combination of the two. Problem consumer loans are generally identified by payment history and current performance of the borrower (delinquency). The Bank manages its consumer loan portfolios by monitoring delinquency and contacting borrowers to encourage repayment, suggesting modifications if appropriate, and, when continued scheduled payments become unrealistic, initiating repossession or foreclosure through appropriate channels. Commercial real estate loans generally fall into two categories, owner-occupied and non-owner occupied. Loans secured by owner occupied real estate are primarily susceptible to changes in the business conditions of the related business. This may be driven by, among other things, industry changes, geographic business changes, changes in the individual fortunes of the business owner, and general economic conditions and changes in business cycles. These same risks apply to commercial loans whether secured by equipment or other personal property or unsecured. Losses on loans secured by owner occupied real estate, equipment, or other personal property generally are dictated by the value of underlying collateral at the time of default and liquidation of the collateral. When default is driven by issues related specifically to the business owner, collateral values tend to provide better repayment support and may result in little or no loss. Alternatively, when default is driven by more general economic conditions, underlying collateral generally has devalued more and results in larger losses due to default. Loans secured by non-owner occupied real estate are primarily susceptible to risks associated with swings in occupancy or vacancy and related shifts in lease rates, rental rates or room rates. Most often these shifts are a result of changes in general economic or market conditions or overbuilding and resultant over-supply. Losses are dependent on value of underlying collateral at the time of default. Values are generally driven by these same factors and influenced by interest rates and required rates of return as well as changes in occupancy costs. Construction loans, whether owner occupied or non-owner occupied commercial real estate loans or residential development loans, are not only susceptible to the related risks described above but the added risks of construction itself including cost over-runs, mismanagement of the project, or lack of demand or market changes experienced at time of completion. Again, losses are primarily related to underlying collateral value and changes therein as described above. Problem commercial loans are generally identified by periodic review of financial information which may include financial statements, tax returns, rent rolls and payment history of the borrower (delinquency). Based on this information the Bank may decide to take any of several courses of action including demand for repayment, additional collateral or guarantors, and, when repayment becomes unlikely through borrower’s income and cash flow, repossession or foreclosure of the underlying collateral. Collateral values may be determined by appraisals obtained through Bank approved, licensed appraisers, qualified independent third parties, public value information (blue book values for autos), sales invoices, or other appropriate means. Appropriate valuations or revaluations are obtained at initiation of the credit and periodically, but not less than every twelve months depending on collateral type, once repayment is questionable and the loan has been classified. Once a loan becomes delinquent and repayment becomes questionable, a Bank collection officer will address collateral shortfalls with the borrower and attempt to obtain additional collateral. If this is not forthcoming and payment in full is unlikely, the Bank will estimate its probable loss, using a recent valuation as appropriate to the underlying collateral less estimated costs of sale, and charge the loan down to the estimated net realizable amount. Depending on the length of time until ultimate collection, the Bank may revalue the underlying collateral and take additional charge-offs as warranted. Revaluations may occur as often as every 3-12 months depending on the underlying collateral and volatility of values. Final charge-offs or recoveries are taken when collateral is liquidated and actual loss is known. Unpaid balances on loans after or during collection and liquidation may also be pursued through lawsuit and attachment of wages or judgment liens on borrower’s other assets. The following table shows the ending balance of current and past due originated loans by loan category as of the date indicated: Analysis of Originated Past Due Loans - As of March 31, 2019 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ 2,231 $ — $ 396 $ 2,627 $ 354,932 $ 357,559 $ — Commercial 767 — 901 1,668 1,927,840 1,929,508 — Total mortgage loans on real estate 2,998 — 1,297 4,295 2,282,772 2,287,067 — Consumer: Home equity lines of credit 1,774 11 362 2,147 276,928 279,075 — Home equity loans 512 24 163 699 30,546 31,245 17 Other 151 — 9 160 44,860 45,020 9 Total consumer loans 2,437 35 534 3,006 352,334 355,340 26 Commercial 1,122 453 371 1,946 225,368 227,314 14 Construction: Residential 785 — — 785 114,903 115,688 — Commercial — — — — 64,576 64,576 — Total construction 785 — — 785 179,479 180,264 — Total originated loans $ 7,342 $ 488 $ 2,202 $ 10,032 $ 3,039,953 $ 3,049,985 $ 40 The following table shows the ending balance of current and past due PNCI loans by loan category as of the date indicated: Analysis of PNCI Past Due Loans - As of March 31, 2019 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ 1,457 $ 270 $ — $ 1,727 $ 161,541 $ 163,268 $ — Commercial 2,898 — 949 3,847 667,550 671,397 — Total mortgage loans on real estate 4,355 270 949 5,574 829,091 834,665 — Consumer: Home equity lines of credit 418 — 1 419 37,671 38,090 — Home equity loans 14 — — 14 3,342 3,356 — Other 151 — — 151 19,850 20,001 — Total consumer loans 583 — 1 584 60,863 61,447 — Commercial 2 99 233 334 38,961 39,295 — Construction: Residential — — — — 30,096 30,096 — Commercial — — — — 7,117 7,117 — Total construction — — — — 37,213 37,213 — Total PNCI loans $ 4,940 $ 369 $ 1,183 $ 6,492 $ 966,128 $ 972,620 $ — The following table shows the ending balance of current and past due originated loans by loan category as of the date indicated: Analysis of Originated Past Due Loans - As of December 31, 2018 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ 1,675 $ 132 $ 478 $ 2,285 $ 341,511 $ 343,796 $ — Commercial 431 1,200 296 1,927 1,909,054 1,910,981 — Total mortgage loans on real estate 2,106 1,332 774 4,212 2,250,565 2,254,777 — Consumer: Home equity lines of credit 908 47 609 1,564 282,889 284,453 — Home equity loans 1,043 24 214 1,281 31,379 32,660 — Other 298 17 — 315 33,705 34,020 — Total consumer loans 2,249 88 823 3,160 347,973 351,133 — Commercial 1,053 579 1,247 2,879 225,756 228,635 — Construction: Residential 209 — — 209 90,494 90,703 — Commercial — — — — 56,208 56,208 — Total construction 209 — — 209 146,702 146,911 — Total loans $ 5,617 $ 1,999 $ 2,844 $ 10,460 $ 2,970,996 $ 2,981,456 $ — The following table shows the ending balance of current and past due PNCI loans by loan category as of the date indicated: Analysis of PNCI Past Due Loans - As of December 31, 2018 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ 1,009 $ 133 $ 156 $ 1,298 $ 168,494 $ 169,792 $ — Commercial 1,646 1,136 1,082 3,864 704,537 708,401 — Total mortgage loans on real estate 2,655 1,269 1,238 5,162 873,031 878,193 — Consumer: Home equity lines of credit 304 35 237 576 40,381 40,957 — Home equity loans 74 — — 74 3,511 3,585 — Other 160 — — 160 21,499 21,659 — Total consumer loans 538 35 237 810 65,391 66,201 — Commercial 678 145 113 936 44,532 45,468 — Construction: Residential — — — — 30,593 30,593 — Commercial — — — — 5,880 5,880 — Total construction — — — — 36,473 36,473 — Total loans $ 3,871 $ 1,449 $ 1,588 $ 6,908 $ 1,019,427 $ 1,026,335 $ — Interest income on originated nonaccrual loans that would have been recognized during the three months ended March 31, 2019 and 2018, if all such loans had been current in accordance with their original terms, totaled $279,000 and $285,000, respectively. Interest income actually recognized on these originated loans during the three months ended March 31, 2019 and 2018 was $33,000 and $22,000, respectively. Interest income on PNCI nonaccrual loans that would have been recognized during the three months ended March 31, 2019 and 2018, if all such loans had been current in accordance with their original terms, totaled $121,000 and $27,000, respectively. Interest income actually recognized on these PNCI loans during the three months ended March 31, 2019 and 2018 was $60,000 and $0. The following table shows the ending balance of nonaccrual originated and PNCI loans by loan category as of the date indicated: Non Accrual Loans As of March 31, 2019 As of December 31, 2018 (in thousands) Originated PNCI Total Originated PNCI Total Mortgage loans on real estate: Residential 1-4 family $ 3,066 $ 308 $ 3,374 $ 3,244 $ 334 $ 3,578 Commercial 4,493 1,445 5,938 9,263 1,468 10,731 Total mortgage loans on real estate 7,559 1,753 9,312 12,507 1,802 14,309 Consumer: Home equity lines of credit 1,366 501 1,867 1,429 885 2,314 Home equity loans 1,599 36 1,635 1,722 47 1,769 Other 28 4 32 3 4 7 Total consumer loans 2,993 541 3,534 3,154 936 4,090 Commercial 3,144 332 3,476 3,755 120 3,875 Construction: Residential — — — — — — Commercial — — — — — — Total construction — — — — — — Total non accrual loans $ 13,696 $ 2,626 $ 16,322 $ 19,416 $ 2,858 $ 22,274 Impaired originated loans are those where management has concluded that it is probable that the borrower will be unable to pay all amounts due in accordance with the original contractual terms of the loan agreement. The following tables show the recorded investment (financial statement balance), unpaid principal balance, average recorded investment, and interest income recognized for impaired Originated and PNCI loans, segregated by those with no related allowance recorded and those with an allowance recorded for the periods indicated. Impaired Originated Loans – As of, or for the Three Months Ended, March 31, 2019 (in thousands) Unpaid principal balance Recorded investment with no related allowance Recorded investment with related allowance Total recorded investment Related Allowance Average recorded investment Interest income recognized Mortgage loans on real estate: Residential 1-4 family $ 4,148 $ 3,481 $ — $ 3,481 $ 55 $ 4,029 $ 6 Commercial 6,771 5,874 592 6,466 37 9,453 22 Total mortgage loans on real estate 10,919 9,355 592 9,947 92 13,482 28 Consumer: Home equity lines of credit 1,857 1,737 58 1,795 18 1,943 4 Home equity loans 2,333 1,639 120 1,759 20 1,963 — Other 46 — 28 28 9 33 — Total consumer loans 4,236 3,376 206 3,582 47 3,939 4 Commercial 4,538 2,301 2,043 4,344 1,223 4,778 — Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total $ 19,693 $ 15,032 $ 2,841 $ 17,873 $ 1,362 $ 22,199 $ 32 Impaired PNCI Loans – As of, or for the Three Months Ended, March 31, 2019 (in thousands) Unpaid principal balance Recorded investment with no related allowance Recorded investment with related allowance Total recorded investment Related Allowance Average recorded investment Interest income recognized Mortgage loans on real estate: Residential 1-4 family $ 344 $ 308 $ — $ 308 $ — $ 321 $ — Commercial 3,089 1,445 — 1,445 — 1,456 58 Total mortgage loans on real estate 3,433 1,753 — 1,753 — 1,777 58 Consumer: Home equity lines of credit 831 401 360 761 112 883 — Home equity loans 242 102 122 224 50 232 — Other 102 64 38 102 7 106 — Total consumer loans 1,175 567 520 1,087 169 1,221 — Commercial 335 113 219 332 219 226 2 Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total $ 4,943 $ 2,433 $ 739 $ 3,172 $ 388 $ 3,224 $ 60 Impaired Originated Loans – As of, or for the Twelve Months Ended, December 31, 2018 (in thousands) Unpaid principal balance Recorded investment with no related allowance Recorded investment with related allowance Total recorded investment Related Allowance Average recorded investment Interest income recognized Mortgage loans on real estate: Residential 1-4 family $ 4,594 $ 3,663 $ 308 $ 3,971 $ 56 $ 3,517 $ 90 Commercial 13,081 10,676 1,765 12,441 42 13,115 137 Total mortgage loans on real estate 17,675 14,339 2,073 16,412 98 16,632 227 Consumer: Home equity lines of credit 1,900 1,749 111 1,860 71 1,885 43 Home equity loans 2,374 1,892 65 1,957 2 1,520 23 Other 3 — 3 3 3 17 2 Total consumer loans 4,277 3,641 179 3,820 76 3,422 68 Commercial 5,433 2,924 2,287 5,211 1,774 4,654 91 Construction: Residential — — — — — 5 — Commercial — — — — — — — Total construction — — — — — 5 — Total $ 27,385 $ 20,904 $ 4,539 $ 25,443 $ 1,948 $ 24,713 $ 386 Impaired PNCI Loans – As of, or for the Twelve Months Ended, December 31, 2018 (in thousands) Unpaid principal balance Recorded investment with no related allowance Recorded investment with related allowance Total recorded investment Related Allowance Average recorded investment Interest income recognized Mortgage loans on real estate: Residential 1-4 family $ 375 $ 334 $ — $ 334 $ — $ 529 $ 5 Commercial 3,110 1,468 — 1,468 — 1,713 183 Total mortgage loans on real estate 3,485 1,802 — 1,802 — 2,242 188 Consumer: Home equity lines of credit 1,027 587 367 954 127 1,120 18 Home equity loans 252 47 197 244 101 155 — Other 106 21 85 106 11 114 — Total consumer loans 1,385 655 649 1,304 239 1,389 18 Commercial 120 113 7 120 7 60 1 Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total $ 4,990 $ 2,570 $ 656 $ 3,226 $ 246 $ 3,691 $ 207 Impaired Originated Loans – As of, or for the Three Months Ended, March 31, 2018 (in thousands) Unpaid principal balance Recorded investment with no related allowance Recorded investment with related allowance Total recorded investment Related Allowance Average recorded investment Interest income recognized Mortgage loans on real estate: Residential 1-4 family $ 4,378 $ 2,678 $ 1,525 $ 4,203 $ 190 $ 4,071 $ 28 Commercial 11,407 9,848 1,262 11,110 154 12,510 44 Total mortgage loans on real estate 15,785 12,526 2,787 15,313 344 16,581 72 Consumer: Home equity lines of credit 1,478 888 527 1,415 146 1,455 10 Home equity loans 1,744 1,193 196 1,389 10 1,347 2 Other 4 — 4 4 4 6 — Total consumer loans 3,226 2,081 727 2,808 160 2,808 12 Commercial 4,756 881 3,740 4,621 2,113 4,545 26 Construction: Residential 136 136 — 136 — 138 2 Commercial — — — — — — — Total construction 136 136 — 136 — 138 2 Total $ 23,903 $ 15,624 $ 7,254 $ 22,878 $ 2,617 $ 24,072 $ 112 Impaired PNCI Loans – As of, or for the Three Months Ended, March 31, 2018 (in thousands) Unpaid principal balance Recorded investment with no related allowance Recorded investment with related allowance Total recorded investment Related Allowance Average recorded investment Interest income recognized Mortgage loans on real estate: Residential 1-4 family $ 1,390 $ 1,332 $ — $ 1,332 $ — $ 1,345 $ 2 Commercial — — — — — — — Total mortgage loans on real estate 1,390 1,332 — 1,332 — 1,345 2 Consumer: Home equity lines of credit 1,065 501 534 1,035 302 1,114 5 Home equity loans 298 40 244 284 120 225 3 Other 274 28 246 274 52 262 2 Total consumer loans 1,637 569 1,024 1,593 474 1,601 10 Commercial — — — — — — Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total $ 3,027 $ 1,901 $ 1,024 $ 2,925 $ 474 $ 2,946 $ 12 Originated loans classified as TDRs and impaired were $9,547,000, $10,253,000, and $9,871,000 at March 31, 2019, December 31, 2018, and March 31, 2018, respectively. PNCI loans classified as TDRs and impaired were $823,000, $615,000, and $1,471,000 at March 31, 2019, December 31, 2018 and March 31, 2018, respectively. The Company had no significant obligations to lend additional funds on Originated or PNCI TDRs as of March 31, 2019, December 31, 2018, or March 31, 2018. The following tables show certain information regarding TDRs that occurred during the periods indicated: TDR Information for the Three Months Ended March 31, 2019 (dollars in thousands) Number Pre-mod outstanding principal balance Post-mod outstanding principal balance Financial impact due to TDR taken as additional provision Number that defaulted during the period Recorded investment of TDRs that defaulted during the period Financial impact due to the default of previous TDR taken as charge- offs or additional provisions Mortgage loans on real estate: Residential 1-4 family 1 $ 163 $ 162 $ — — $ — $ — Commercial — — — — — — — Total mortgage loans on real estate 1 163 162 — — — — Consumer: Home equity lines of credit — — — — — — — Home equity loans 1 121 120 1 — — — Other — — — — — — — Total consumer loans 1 121 120 1 — — — Commercial 2 15 15 — 1 7 — Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total 4 $ 299 $ 297 $ 1 1 $ 7 $ — TDR Information for the Three Months Ended March 31, 2018 (dollars in thousands) Number Pre-mod outstanding principal balance Post-mod outstanding principal balance Financial impact due to TDR taken as additional provision Number that defaulted during the period Recorded investment of TDRs that defaulted during the period Financial impact due to the default of previous TDR taken as charge- offs or additional provisions Mortgage loans on real estate: Residential 1-4 family — $ — $ — $ — — $ — $ — Commercial 1 384 384 11 1 169 — Total mortgage loans on real estate 1 384 384 11 1 169 — Consumer: Home equity lines of credit 1 133 138 — — — — Home equity loans 1 121 121 — — — — Other — — — — — — — Total consumer loans 2 254 259 — — — — Commercial — — — — — — — Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total 3 $ 638 $ 643 $ 11 1 $ 169 $ — Modifications classified as TDRs can include one or a combination of the following: rate modifications, term extensions, interest only modifications, either temporary or long-term, payment modifications, and collateral substitutions/additions. For all new TDRs, an impairment analysis is conducted. If the loan is determined to be collateral dependent, any additional amount of impairment will be calculated based on the difference between estimated collectible value and the current carrying balance of the loan. This difference could result in an increased provision and is typically charged off. If the asset is determined not to be collateral dependent, the impairment is measured on the net present value difference between the expected cash flows of the restructured loan and the cash flows which would have been received under the original terms. The effect of this could result in a requirement for additional provision to the reserve. The effect of these required provisions for the period are indicated above. Typically if a TDR defaults during the period, the loan is then considered collateral dependent and, if it was not already considered collateral dependent, an appropriate provision will be reserved or charge will be taken. The additional provisions required resulting from default of previously modified TDR’s are noted above.

Leases

Leases	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Leases	Note 6 – Leases The The The following table presents the components of lease expense for the three months ended March 31 2019: Three months ended (in thousands) March 31, 2019 Operating lease cost $ 1,311 Short-term lease cost 71 Variable lease cost (5 ) Sublease income (34 ) Total lease cost $ 1,343 Prior to the adoption of ASU 2016-02, rent expense under operating leases was $921,000 during the three months ended March 31, 2018. Rent expense was offset by rent income of $10,000 during the three months ended March 31, 2018. The following table presents supplemental cash flow information related to leases for the three months ended March 31, 2019: Three months ended (in thousands) March 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 1,218 ROUA obtained in exchange for operating lease liabilities $ 32,006 The following table presents the weighted average operating lease term and discount rate at March 31, 2019: As of March 31, 2019: Weighted-average remaining lease term 9.5 years Weighted-average discount rate 3.17 % At March 31, 2019, future expected operating lease payments are as follows: (in thousands) Periods ending December 31, 2019 $ 3,519 2020 4,380 2021 4,226 2022 3,887 2023 3,208 Thereafter 16,455 35,675 Discount for present value of expected cash flows (5,471 ) Lease liability at March 31, 2019 $ 30,204

Deposits

Deposits	3 Months Ended
	Mar. 31, 2019
Banking and Thrift [Abstract]
Deposits	Note 7 - Deposits A summary of the balances of deposits follows (in thousands): March 31, December 31, 2019 2018 Noninterest-bearing demand $ 1,761,559 $ 1,760,580 Interest-bearing demand 1,297,672 1,252,366 Savings 1,925,168 1,921,324 Time certificates, $250,000 and above 135,716 132,429 Other time certificates 310,147 299,767 Total deposits $ 5,430,262 $ 5,366,466 Certificate of deposit balances of $50,000,000 and $60,000,000 from the State of California were included in time certificates, over $250,000, at March 31, 2019 and December 31, 2018, respectively. The . Overdrawn deposit balances of $1,207,000 and $1,469,000 were classified as consumer loans at March 31, 2019 and December 31, 2018, respectively.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 8 - Commitments and Contingencies The following table presents a summary of the Bank’s commitments and contingent liabilities: (in thousands) March 31, 2019 December 31, 2018 Financial instruments whose amounts represent risk: Commitments to extend credit: Commercial loans $ 316,382 $ 306,191 Consumer loans 514,413 496,575 Real estate mortgage loans 163,733 140,292 Real estate construction loans 232,385 248,996 Standby letters of credit 11,743 11,346 Deposit account overdraft privilege 115,552 111,956

Shareholders' Equity

Shareholders' Equity	3 Months Ended
	Mar. 31, 2019
Federal Home Loan Banks [Abstract]
Shareholders' Equity	Note 9 – Shareholders’ Equity Dividends Paid The Bank paid to the Company cash dividends in the aggregate amounts of $8,114,000 and $4,372,000 during the three months ended March 31, 2019 and 2018, respectively. The Bank is regulated by the Federal Deposit Insurance Corporation (FDIC) and the State of California Department of Business Oversight (DBO). Absent approval from the Commissioner of the DBO, California banking laws generally limit the Bank’s ability to pay dividends to the lesser of (1) retained earnings or (2) net income for the last three fiscal years, less cash distributions paid during such period. Stock Repurchase Plan On August 21, 2007, the Board of Directors adopted a plan to repurchase, as conditions warrant, up to 500,000 shares of the Company’s common stock on the open market. The timing of purchases and the exact number of shares to be purchased will depend on market conditions. This stock repurchase plan has no expiration date. As of March 31, 2019, the Company had repurchased 196,566 Stock Repurchased Under Equity Compensation Plans During the three months ended March 31, 2019 and 2018, employees tendered 16,418 and 134 shares, respectively, of the Company’s common stock with market value of $647,000, and $4,000, respectively, in lieu of cash to exercise options to purchase shares of the Company’s stock and to pay income taxes related to equity compensation plan instruments as permitted by the Company’s shareholder-approved equity compensation plans. The tendered shares were retired. The market value of tendered shares is the last market trade price at closing on the day an option is exercised. Stock repurchased under equity incentive plans are not included in the total of stock repurchased under the stock repurchase plan announced on August 21, 2007.

Stock Options and Other Equity-

Stock Options and Other Equity-Based Incentive Instruments	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options and Other Equity-Based Incentive Instruments	Note 10 - Stock Options and Other Equity-Based Incentive Instruments Stock option activity during the three months ended March 31, 2019 is summarized in the following table: Number of Shares Option Price per Share Weighted Average Exercise Price Outstanding at December 31, 2018 343,000 $ 12.63 $ 16.67 Options granted — — — — Options exercised (41,000 ) $12.63 to $19.46 15.78 Options forfeited — — — — Outstanding at March 31, 2019 302,000 $14.54 to $23.21 $ 16.88 The following table shows the number, weighted-average exercise price, intrinsic value, and weighted average remaining contractual life of options exercisable, options not yet exercisable and total options outstanding as of March 31, 2019: Currently Exercisable Currently Not Exercisable Total Outstanding Number of options 300,875 1,125 302,000 Weighted average exercise price $ 16.86 $ 23.21 $ 16.88 Intrinsic value (in thousands) $ 5,095 $ 12 $ 5,107 Weighted average remaining contractual term (yrs.) 3.4 5.8 3.4 The 1,125 Restricted stock unit (RSU) activity is summarized in the following table for the dates indicated: Service Market Plus Outstanding at December 31, 2018 66,947 45,536 RSUs granted — — RSUs added through dividend credits 322 — RSUs released (355 ) — RSUs forfeited/expired — — Outstanding at March 31, 2019 66,914 45,536 The 66,914 of service condition vesting RSUs outstanding as of March 31, 2019 include a feature whereby each RSU outstanding is credited with a dividend amount equal to any common stock cash dividend declared and paid, and the credited amount is divided by the closing price of the Company’s stock on the dividend payable date to arrive at an additional amount of RSUs outstanding under the original grant. of service condition vesting RSUs outstanding as of March 31, 2019 are expected to vest, and be released, on a weighted-average basis, over the next 1.2 years. The Company expects to recognize $1,465,000 of pre-tax compensation costs related to these service condition vesting RSUs between March 31, 2019 and their vesting dates. The Company did not modify any service condition vesting RSUs during 2018 or during the three months ended March 31, 2019. The 45,536 of market plus service condition vesting RSUs outstanding as of March 31, 2019 are expected to vest, and be released, on a weighted-average basis, over the next 1.2 years. The Company expects to recognize $633,000 of pre-tax compensation costs related to these RSUs between March 31, 2019 and their vesting dates. As of March 31, 2019, the number of market plus service condition vesting RSUs outstanding that will actually vest, and be released, may be reduced to zero or increased to 68,304 depending on the total return of the Company’s common stock versus the total return of an index of bank stocks from the grant date to the vesting date. The Company did not modify any market plus service condition vesting RSUs during 2018 or during the three months ended March 31, 2019.

Noninterest Income and Expense

Noninterest Income and Expense	3 Months Ended
	Mar. 31, 2019
Other Income and Expenses [Abstract]
Noninterest Income and Expense	Note 11 - Noninterest Income and Expense The following table summarizes the Company’s noninterest income for the periods indicated: Three months ended March 31, (dollars in thousands) 2019 2018 ATM and interchange fees $ 4,581 $ 4,235 Service charges on deposit accounts 3,880 3,779 Other service fees 771 714 Mortgage banking service fees 483 517 Change in value of mortgage servicing rights (645 ) 111 Total service charges and fees 9,070 9,356 Increase in cash value of life insurance 775 608 Asset management and commission income 642 876 Gain on sale of loans 412 626 Lease brokerage income 220 128 Sale of customer checks 140 101 Gain on sale of foreclosed assets 99 371 Gain (loss) on marketable equity securities 36 (48 ) Loss on disposal of fixed assets (38 ) (13 ) Other 508 285 Total other noninterest income 2,794 2,934 Total noninterest income $ 11,864 $ 12,290 The components of noninterest expense were as follows (in thousands): Three months ended March 31, 2019 2018 Base salaries, net of deferred loan origination costs $ 16,757 $ 13,962 Incentive compensation 2,567 2,452 Benefits and other compensation costs 5,804 5,238 Total salaries and benefits expense 25,128 21,652 Occupancy 3,774 2,681 Data processing and software 3,349 2,514 Equipment 1,867 1,551 Intangible amortization 1,431 339 Advertising 1,331 838 ATM and POS network charges 1,323 1,226 Professional fees 839 773 Telecommunications 797 701 Regulatory assessments and insurance 511 430 Merger and acquisition expense — 476 Postage 310 358 Operational losses 225 294 Courier service 270 267 Other miscellaneous expense 4,358 4,062 Total other noninterest expense 20,385 16,510 Total noninterest expense $ 45,513 $ 38,162

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Note 12 – Earnings Per Share Basic earnings per share represent income available to common shareholders divided by the weighted-average number of common shares outstanding during the period. Diluted earnings per share reflect additional common shares that would have been outstanding if dilutive potential common shares had been issued, as well as any adjustments to income that would result from assumed issuance. Potential common shares that may be issued by the Company relate from outstanding stock options and restricted stock units (RSUs), and are determined using the treasury stock method. Earnings per share have been computed based on the following: Three months ended March 31, (in thousands) 2019 2018 Net income $ 22,726 $ 13,910 Average number of common shares outstanding 30,424 22,956 Effect of dilutive stock options and restricted stock 234 327 Average number of common shares outstanding used to calculate diluted earnings per share 30,658 23,283 Options excluded from diluted earnings per share because the effect of these options was antidilutive — —

Comprehensive Income

Comprehensive Income	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Comprehensive Income	Note 13 – Comprehensive Income Accounting principles generally require that recognized revenue, expenses, gains and losses be included in net income. Although certain changes in assets and liabilities, such as unrealized gains and losses on available-for-sale securities, are reported as a separate component of the equity section of the balance sheet, such items, along with net income, are components of other comprehensive income. The components of other comprehensive income (loss) and related tax effects are as follows: Three months ended March 31, (in thousands) 2019 2018 Unrealized holding gains (losses) on available for sale securities before reclassifications 12,710 $ (15,265 ) Amounts reclassified out of accumulated other comprehensive income: Adoption ASU 2016-01 — 62 Adoption ASU 2018-02 — (425 ) Total amounts reclassified out of accumulated other comprehensive income — (363 ) Unrealized holding gains (losses) on available for sale securities after reclassifications 12,710 (15,628 ) Tax effect (3,758 ) 4,602 Unrealized holding gains (losses) on available for sale securities, net of tax 8,952 (11,026 ) Change in unfunded status of the supplemental retirement plans before reclassifications (89 ) 667 Amounts reclassified out of accumulated other comprehensive income: Amortization of prior service cost (13 ) (13 ) Amortization of actuarial losses 102 127 Adoption ASU 2018-02 — (668 ) Total amounts reclassified out of accumulated other comprehensive income 89 (554 ) Change in unfunded status of the supplemental retirement plans after reclassifications — 113 Tax effect — (33 ) Change in unfunded status of the supplemental retirement plans, net of tax — 80 Total other comprehensive income (loss) $ 8,952 $ (10,946 ) The components of accumulated other comprehensive loss, included in shareholders’ equity, are as follows: (in thousands) March 31, 2019 December 31, 2018 Net unrealized loss on available for sale securities $ (8,264 ) $ (20,974 ) Tax effect 2,443 6,201 Unrealized holding loss on available for sale securities, net of tax (5,821 ) (14,773 ) Unfunded status of the supplemental retirement plans (4,802 ) (4,802 ) Tax effect 1,420 1,420 Unfunded status of the supplemental retirement plans, net of tax (3,382 ) (3,382 ) Joint beneficiary agreement liability 276 276 Tax effect — — Joint beneficiary agreement liability, net of tax 276 276 Accumulated other comprehensive loss $ (8,927 ) $ (17,879 )

Fair Value Measurement

Fair Value Measurement	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurement	Note 14 - Fair Value Measurement The Company utilizes fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, income approach, and/or the cost approach. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability including assumptions about the risk inherent in a particular valuation technique, the effect of a restriction on the sale or use of an asset and the risk of nonperformance. Marketable equity securities, debt securities available-for-sale, loans held for sale, and mortgage servicing rights are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets on a nonrecurring basis, such loans held for investment and certain other assets. These nonrecurring fair value adjustments typically involve application impairment write-downs of individual assets. The Company groups assets and liabilities at fair value in three levels, based on the markets in which the assets and liabilities are traded and the observable nature of the assumptions used to determine fair value. These levels are: Level 1 - Valuation is based upon quoted prices for identical instruments traded in active markets. Level 2 - Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. Level 3 - Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models and similar techniques. Marketable equity securities and debt securities available for sale – Marketable equity securities and debt securities available for sale are recorded at fair value on a recurring basis. Fair value measurement is based upon quoted prices, if available. If quoted prices are not available, fair values are measured using independent pricing models or other model-based valuation techniques such as the present value of future cash flows, adjusted for the security’s credit rating, prepayment assumptions and other factors such as credit loss assumptions. Level 1 securities include those traded on an active exchange, such as the New York Stock Exchange, U.S. Treasury securities that are traded by dealers or brokers in active over-the-counter markets and money market funds. Level 2 securities include mortgage-backed securities issued by government sponsored entities, municipal bonds and corporate debt securities. The Company had no securities classified as Level 3 during any of the periods covered in these financial statements. Loans held for sale – Loans held for sale are carried at the lower of cost or fair value. The fair value of loans held for sale is based on what secondary markets are currently offering for loans with similar characteristics. As such, we classify those loans subjected to recurring fair value adjustments as Level 2. Impaired originated and PNCI loans – Originated and PNCI loans are not recorded at fair value on a recurring basis. However, from time to time, an originated or PNCI loan is considered impaired and an allowance for loan losses is established. Originated and PNCI loans for which it is probable that payment of interest and principal will not be made in accordance with the original contractual terms of the loan agreement are considered impaired. The fair value of an impaired originated or PNCI loan is estimated using one of several methods, including collateral value, fair value of similar debt, enterprise value, liquidation value and discounted cash flows. Those impaired originated and PNCI loans not requiring an allowance represent loans for which the fair value of the expected repayments or collateral exceed the recorded investments in such loans. Impaired originated and PNCI loans where an allowance is established based on the fair value of collateral require classification in the fair value hierarchy. When the fair value of the collateral is based on an observable market price or a current appraised value which uses substantially observable data, the Company records the impaired originated or PNCI loan as nonrecurring Level 2. When an appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value, or the appraised value contains a significant unobservable assumption, such as deviations from comparable sales, and there is no observable market price, the Company records the impaired originated or PNCI loan as nonrecurring Level 3. Foreclosed assets - Foreclosed assets include assets acquired through, or in lieu of, loan foreclosure. Foreclosed assets are held for sale and are initially recorded at fair value at the date of foreclosure, establishing a new cost basis. Subsequent to foreclosure, management periodically performs valuations and the assets are carried at the lower of carrying amount or fair value less cost to sell. When the fair value of foreclosed assets is based on an observable market price or a current appraised value which uses substantially observable data, the Company records the impaired originated loan as nonrecurring Level 2. When an appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value, or the appraised value contains a significant unobservable assumption, such as deviations from comparable sales, and there is no observable market price, the Company records the foreclosed asset as nonrecurring Level 3. Revenue and expenses from operations and changes in the valuation allowance are included in other noninterest expense. Mortgage servicing rights - Mortgage servicing rights are carried at fair value. A valuation model, which utilizes a discounted cash flow analysis using a discount rate and prepayment speed assumptions is used in the computation of the fair value measurement. While the prepayment speed assumption is currently quoted for comparable instruments, the discount rate assumption currently requires a significant degree of management judgment and is therefore considered an unobservable input. As such, the Company classifies mortgage servicing rights subjected to recurring fair value adjustments as Level 3. The table below presents the recorded amount of assets and liabilities measured at fair value on a recurring basis (in thousands): Total Level 1 Level 2 Level 3 Fair value at March 31, 2019 Marketable equity securities $ 2,910 $ 2,910 $ — $ — Debt securities available for sale: Obligations of U.S. government corporations and agencies 627,100 — 627,100 — Obligations of states and political subdivisions 129,349 — 129,349 — Corporate bonds 4,478 — 4,478 — Asset backed securities 352,589 — 352,589 — Loans held for sale 5,410 — 5,410 — Mortgage servicing rights 6,572 — — 6,572 Total assets measured at fair value $ 1,128,408 $ 2,910 $ 1,118,926 $ 6,572 Total Level 1 Level 2 Level 3 Fair value at December 31 , 2018 Marketable equity securities $ 2,874 $ 2,874 $ — $ — Debt securities available for sale: Obligations of U.S. government corporations and agencies 629,981 — 629,981 — Obligations of states and political subdivisions 126,072 — 126,072 — Corporate bonds 4,478 — 4,478 — Asset backed securities 354,505 — 354,505 — Loans held for sale 3,687 — 3,687 — Mortgage servicing rights 7,098 — — 7,098 Total assets measured at fair value $ 1,128,695 $ 2,874 $ 1,118,723 $ 7,098 Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally corresponds with the Company’s quarterly valuation process. There were no transfers between any levels during the three months ended March 31, 2019 or the year ended December 31, 2018. The following table provides a reconciliation of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the time periods indicated. Had there been any transfer into or out of Level 3 during the time periods indicated, the amount included in the “Transfers into (out of) Level 3” column would represent the beginning balance of an item in the period (interim quarter) during which it was transferred (in thousands): Beginning Balance Transfers into (out of) Level 3 Change Included in Earnings Issuances Ending Balance Three months ended March 31 , 2019: Mortgage servicing rights $ 7,098 — $ (645 ) $ 119 $ 6,572 2018: Mortgage servicing rights $ 6,687 — $ 111 $ 155 $ 6,953 The key unobservable inputs used in determining the fair value of mortgage servicing rights are mortgage prepayment speeds and the discount rate used to discount cash projected cash flows. Generally, any significant increases in the mortgage prepayment speed and discount rate utilized in the fair value measurement of the mortgage servicing rights will result in a negative fair value adjustments (and decrease in the fair value measurement). Conversely, a decrease in the mortgage prepayment speed and discount rate will result in a positive fair value adjustment (and increase in the fair value measurement). The following table presents quantitative information about recurring Level 3 fair value measurements at March 31, 2019 and December 31, 2018: Fair Value (in thousands) Valuation Technique Unobservable Inputs Range, Weighted Average As of March 31, 2019: Mortgage Servicing Rights $ 6,572 Discounted Constant 5.4% - 27.1%; 8.9% Discount rate 12% - 13%; 12% As of December 31, 2018: Mortgage Servicing Rights $ 7,098 Discounted Constant 5.0% - 27.3%; 7.6% Discount rate 12% - 13%; 12% The tables below present the recorded investment in assets and liabilities measured at fair value on a nonrecurring basis, as of the dates indicated (in thousands): Total Level 1 Level 2 Level 3 Total Gains (Losses) Three months ended March 31, 2019 Fair value: Impaired Originated & PNCI loans $ 212 — — $ 212 $ (197 ) Foreclosed assets 214 — — 214 98 Total assets measured at fair value $ 426 — — $ 426 $ (99 ) Total Level 1 Level 2 Level 3 Total Gains (Losses) Year ended December 31, 2018 Fair value: Impaired Originated & PNCI loans $ 281 — — $ 281 $ (294 ) Foreclosed assets 1,311 — — 1,311 (8 ) Total assets measured at fair value $ 1,592 — — $ 1,592 $ (302 ) Total Level 1 Level 2 Level 3 Total Gains (Losses) Three months ended March 31, 2018 Fair value: Impaired Originated & PNCI loans $ 2,103 — — $ 2,103 $ (795 ) Foreclosed assets 774 — — 774 (87 ) Total assets measured at fair value $ 2,877 — — $ 2,877 $ (882 ) The impaired originated and PNCI loan amount above represents impaired, collateral dependent loans that have been adjusted to fair value. When the Company identifies a collateral dependent loan as impaired, the Company measures the impairment using the current fair value of the collateral, less selling costs. Depending on the characteristics of a loan, the fair value of collateral is generally estimated by obtaining external appraisals. If the Company determines that the value of the impaired loan is less than the recorded investment in the loan, the Company recognizes this impairment and adjust the carrying value of the loan to fair value through the allowance for loan and lease losses. The loss represents charge-offs or impairments on collateral dependent loans for fair value adjustments based on the fair value of collateral. The carrying value of loans fully charged-off is zero. The foreclosed assets amount above represents impaired real estate that has been adjusted to fair value. Foreclosed assets represent real estate which the Company has taken control of in partial or full satisfaction of loans. At the time of foreclosure, other real estate owned is recorded at fair value less costs to sell, which becomes the property’s new basis. Any write-downs based on the asset’s fair value at the date of acquisition are charged to the allowance for loan and lease losses. After foreclosure, management periodically performs valuations such that the real estate is carried at the lower of its new cost basis or fair value, net of estimated costs to sell. Fair value adjustments on other real estate owned are recognized within net loss on real estate owned. The loss represents impairments on real estate owned for fair value adjustments based on the fair value of the real estate. The Company’s property appraisals are primarily based on the sales comparison approach and income approach methodologies, which consider recent sales of comparable properties, including their income generating characteristics, and then make adjustments to reflect the general assumptions that a market participant would make when analyzing the property for purchase. These adjustments may increase or decrease an appraised value and can vary significantly depending on the location, physical characteristics and income producing potential of each property. Additionally, the quality and volume of market information available at the time of the appraisal can vary from period to period and cause significant changes to the nature and magnitude of comparable sale adjustments. Given these variations, comparable sale adjustments are generally not a reliable indicator for how fair value will increase or decrease from period to period. Under certain circumstances, management discounts are applied based on specific characteristics of an individual property. The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at March 31, 2019: Fair Value (in thousands) Valuation Technique Unobservable Inputs Range, Weighted Average March 31, 2019 Impaired Originated & PNCI loans $ 212 Sales comparison approach Adjustment for differences between comparable sales Not meaningful Income approach Capitalization rate N/A Foreclosed assets (Residential real estate) $ 214 Sales comparison approach Adjustment for differences between comparable sales Not meaningful The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at December 31, 2018: Fair Value (in thousands) Valuation Technique Unobservable Inputs Range, Weighted Average December 31, 2018 Impaired Originated & PNCI loans $ 281 Sales comparison approach Adjustment for differences between comparable sales (16.3%) - 35.14%; % Income approach Capitalization rate N/A Foreclosed assets (Residential real estate) $ 693 Sales comparison approach Adjustment for differences between comparable sales (21.83%) - 7.25%; (3.75%) Foreclosed assets (Commercial real estate) $ 618 Sales comparison approach Adjustment for differences between comparable sales (65%) - 20%; (45%) Fair values for financial instruments are management’s estimates of the values at which the instruments could be exchanged in a transaction between willing parties. The Company uses the exit price notion when measuring the fair value of financial instruments. These estimates are subjective and may vary significantly from amounts that would be realized in actual transactions. In addition, other significant assets are not considered financial assets including, any mortgage banking operations, deferred tax assets, and premises and equipment. Further, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on the fair value estimates and have not been considered in any of these estimates. March 31, 2019 December 31, 2018 (in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Financial assets: Level 1 inputs: Cash and due from banks $ 105,103 $ 105,103 $ 119,781 $ 119,781 Cash at Federal Reserve and other banks 213,605 213,605 107,752 107,752 Level 2 inputs: Securities held to maturity 431,016 430,773 444,936 437,370 Restricted equity securities 17,250 N/A 17,250 N/A Loans held for sale 5,410 5,410 3,687 4,616 Level 3 inputs: Loans, net 4,002,267 4,053,496 3,989,432 4,006,986 Financial liabilities: Level 2 inputs: Deposits 5,430,262 5,427,004 5,366,466 5,362,173 Other borrowings 12,466 12,466 15,839 15,839 Level 3 inputs: Junior subordinated debt 57,085 56,180 57,042 62,610 (in thousands) Contract Amount Fair Value Contract Amount Fair Value Off-balance sheet: Level 3 inputs: Commitments $ 1,226,913 $ 12,269 $ 1,192,054 $ 11,921 Standby letters of credit 11,743 117 11,346 113 Overdraft privilege commitments 115,552 1,156 111,956 1,120

Regulatory Matters

Regulatory Matters	3 Months Ended
	Mar. 31, 2019
Banking and Thrift [Abstract]
Regulatory Matters	Note 15 - Regulatory Matters The Company is 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 consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company must meet specific capital guidelines that involve quantitative measures of the Company’s assets, liabilities and certain off-balance-sheet Quantitative measures established by regulation to ensure capital adequacy require the Company to maintain minimum amounts and ratios (set forth in the table below) of total, Tier 1, and common equity Tier 1capital to risk-weighted assets, and of Tier 1 capital to average assets. The following tables present actual and required capital ratios as of March 31, 2019 and December 31, 2018 for the Company and the Bank under applicable Basel III Capital Rules. The minimum capital amounts presented include the minimum required capital levels as of March 31, 2019 and December 31, 2018 based on the then phased-in phased-in. Minimum Capital Required to be Required – Basel III Considered Well Actual Fully Phased In Capitalized Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) As of March 31, 2019: Total Capital (to Risk Weighted Assets): Consolidated $ 700,542 14.73 % $ 449,380 10.50 % N/A N/A Tri Counties Bank $ 697,549 14.67 % $ 499,195 10.50 % $ 475,424 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 665,688 14.00 % $ 404,260 8.50 % N/A N/A Tri Counties Bank $ 662,695 13.94 % $ 404,111 8.50 % $ 380,339 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 610,317 12.83 % $ 332,920 7.00 % N/A N/A Tri Counties Bank $ 662,695 13.94 % $ 332,797 7.00 % $ 309,026 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 665,688 10.84 % $ 245,649 4.00 % N/A N/A Tri Counties Bank $ 662,695 10.79 % $ 245,643 4.00 % $ 307,054 5.00 % Minimum Capital Minimum Capital Required to be Required – Basel III Required – Basel III Considered Well Actual Phase-in Schedule Fully Phased In Capitalized Amount Ratio Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) As of December 31, 2018: Total Capital (to Risk Weighted Assets): Consolidated $ 682,419 14.40 % $ 467,874 9.875 % $ 497,486 10.50 % N/A N/A Tri Counties Bank $ 680,624 14.37 % $ 467,704 9.875 % $ 497,305 10.50 % $ 473,624 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 647,262 13.66 % $ 373,115 7.875 % $ 402,727 8.50 % N/A N/A Tri Counties Bank $ 645,467 13.63 % $ 372,979 7.875 % $ 402,581 8.50 % $ 378,899 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 591,933 12.49 % $ 302,045 6.375 % $ 331,658 7.00 % N/A N/A Tri Counties Bank $ 645,467 13.63 % $ 301,935 6.375 % $ 331,537 7.00 % $ 307,856 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 647,262 10.68 % $ 242,452 4.000 % $ 242,452 4.00 % N/A N/A Tri Counties Bank $ 645,467 10.65 % $ 242,447 4.000 % $ 242,447 4.00 % $ 303,059 5.00 % As of March 31, 2019 and December 31, 2018, capital levels at the Company and the Bank exceed all capital adequacy requirements under the Basel III Capital Rules. Also, at March 31, 2019 and December 31, 2018, the Bank’s capital levels exceeded the minimum amounts necessary to be considered well capitalized under the current regulatory framework for prompt corrective action. The Basel III Capital Rules require for all banking organizations to maintain a capital conservation buffer above the minimum risk-based capital requirements in order to avoid certain limitations on capital distributions, stock repurchases and discretionary bonus payments to executive officers. The capital conservation buffer is exclusively composed of common equity tier 1 capital, and it applies to each of the risk-based capital ratios but not the leverage ratio. At March 31, 2019, the Company and the Bank are in compliance with the capital conservation buffer requirement.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation TriCo Bancshares (the “Company” or “we”) is a California corporation organized to act as a bank holding company for Tri Counties Bank (the “Bank”). The Company and the Bank are headquartered in Chico, California. The Bank is a California-chartered bank that is engaged in the general commercial banking business in 29 California counties. The Company has five capital subsidiary business trusts (collectively, the “Capital Trusts”) that issued trust preferred securities, including two organized by the Company and three acquired with the acquisition of North Valley Bancorp. The consolidated financial statements are prepared in accordance with accounting policies generally accepted in the United States of America and general practices in the banking industry. All adjustments necessary for a fair presentation of these consolidated financial statements have been included and are of a normal and recurring nature. The financial statements include the accounts of the Company. All inter-company accounts and transactions have been eliminated in consolidation. For financial reporting purposes, the Company’s investments in the Capital Trusts of $1,714,000 are accounted for under the equity method and, accordingly, are not consolidated and are included in other assets on the consolidated balance sheet. The subordinated debentures issued and guaranteed by the Company and held by the Capital Trusts are reflected as debt on the Company’s consolidated balance sheet.
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America 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 and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission. These unaudited condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 (the “2018 Annual Report”). The Company believes that the disclosures made are adequate to make the information not misleading.
Segment and Significant Group Concentration of Credit Risk	Segment and Significant Group Concentration of Credit Risk The Company grants agribusiness, commercial, consumer, and residential loans to customers located throughout northern and central California. The Company has a diversified loan portfolio within the business segments located in this geographical area. The Company currently classifies all its operation into one business segment that it denotes as community banking.
Geographical Descriptions	Geographical Descriptions For the purpose of describing the geographical location of the Company’s operations, the Company has defined northern California as that area of California north of, and including, Stockton to the east and San Jose to the west; central California as that area of the state south of Stockton and San Jose, to and including, Bakersfield to the east and San Luis Obispo to the west; and southern California as that area of the state south of Bakersfield and San Luis Obispo.
Cash and Cash Equivalents	Cash and Cash Equivalents Net cash flows are reported for loan and deposit transactions and other borrowings. For purposes of the consolidated statement of cash flows, cash, due from banks with original maturities less than 90 days, interest-earning deposits in other banks, and Federal funds sold are considered to be cash equivalents.
Accounting Standards Adopted in 2019	Accounting Standards Adopted in 2019 The Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-02, Leases (Topic 842) The FASB issued ASU 2017-08, Receivables—Nonrefundable Fees and Other Costs (Topic 310). ASU 2017-08 shortens the amortization period for certain callable debt securities held at a premium to require such premiums to be amortized to the earliest call date unless applicable guidance related to certain pools of securities is applied to consider estimated prepayments. Under prior guidance, entities were generally required to amortize premiums on individual, non-pooled callable debt securities as a yield adjustment over the contractual life of the security. ASU 2017-08 does not change the accounting for callable debt securities held at a discount. ASU 2017-08 was effective for the Company on January 1, 2019, and did not have an impact on the Company’s consolidated financial statements.
Accounting Standards Pending Adoption	Accounting Standards Pending Adoption The FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326) FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other: Simplifying the Test for Goodwill Impairment (Topic 350): ASU 2017-04 eliminates step two of the goodwill impairment test (the hypothetical purchase price allocation used to determine the implied fair value of goodwill) when step one (determining if the carrying value of a reporting unit exceeds its fair value) is failed. Instead, entities simply will compare the fair value of a reporting unit to its carrying amount and record goodwill impairment for the amount by which the reporting unit’s carrying amount exceeds its fair value. ASU 2017-04 will be effective for the Company on January 1, 2020 and is not expected to have a significant impact on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, “Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement.” This ASU eliminates, adds and modifies certain disclosure requirements for fair value measurements. Among the changes, entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. ASU No. 2018-13 is effective for interim and annual reporting periods beginning after December 15, 2019; early adoption is permitted. Entities are also allowed to elect early adoption the eliminated or modified disclosure requirements and delay adoption of the new disclosure requirements until their effective date. As ASU No. 2018-13 only revises disclosure requirements, it will not have a significant impact on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-14, “Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans

Business Combinations (Tables)

Business Combinations (Tables)	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Schedule of Fair Value of Consideration Transferred, Identifiable Net Assets Acquired and Resulting Goodwill	The following table summarizes the consideration paid for FNBB and the amounts of assets acquired and liabilities assumed that were recorded at the acquisition date (in thousands). FNB Bancorp July 6, 2018 Fair value of consideration transferred: Fair value of shares issued $ 284,437 Cash consideration 6,695 Total fair value of consideration transferred 291,132 Assets acquired: Cash and cash equivalents 37,308 Securities available for sale 335,667 Restricted equity securities 7,723 Loans 834,683 Premises and equipment 30,522 Cash value of life insurance 16,817 Core deposit intangible 27,605 Other assets 16,214 Total assets acquired 1,306,539 Liabilities assumed: Deposits 991,935 Other liabilities 15,133 Short-term borrowings—Federal Home Loan Bank 165,000 Total liabilities assumed 1,172,068 Total net assets acquired 134,471 Goodwill recognized $ 156,661
Summary of Estimated Fair Value Adjustments Resulting in Goodwill	A summary of the estimated fair value adjustments resulting in the goodwill recorded in the FNB Bancorp acquisition are presented below (in thousands): FNB Bancorp July 6, 2018 Value of stock consideration paid to FNB Bancorp Shareholders $ 284,437 Cash consideration 6,695 Less: Cost basis net assets acquired 114,030 Fair value adjustments: Investments (1,081 ) Loans (22,390 ) Premises and Equipment 21,590 Core deposit intangible 27,327 Deferred income taxes (6,394 ) Other 1,389 Goodwill $ 156,661

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2019
Investments Schedule [Abstract]
Amortized Cost and Estimated Fair Values of Investments Securities	The amortized cost and estimated fair values of investments in debt securities are summarized in the following tables: March 31, 2019 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 631,914 $ 1,862 $ (6,676 ) $ 627,100 Obligations of states and political subdivisions 128,706 1,242 (599 ) 129,349 Corporate bonds 4,394 84 — 4,478 Asset backed securities 356,766 141 (4,318 ) 352,589 Total debt securities available for sale $ 1,121,780 $ 3,329 $ (11,593 ) $ 1,113,516 Debt Securities Held to Maturity Obligations of U.S. government agencies $ 416,418 $ 2,190 $ (2,581 ) $ 416,027 Obligations of states and political subdivisions 14,598 173 (25 ) 14,746 Total debt securities held to maturity $ 431,016 $ 2,363 $ (2,606 ) $ 430,773 December 31, 2018 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 647,288 $ 771 $ (18,078 ) $ 629,981 Obligations of states and political subdivisions 128,890 294 (3,112 ) 126,072 Corporate bonds 4,381 97 — 4,478 Asset backed securities 355,451 73 (1,019 ) 354,505 Total debt securities available for sale $ 1,136,010 $ 1,235 $ (22,209 ) $ 1,115,036 Debt Securities Held to Maturity Obligations of U.S. government agencies $ 430,343 $ 327 $ (7,745 ) $ 422,925 Obligations of states and political subdivisions 14,593 82 (230 ) 14,445 Total debt securities held to maturity $ 444,936 $ 409 $ (7,975 ) $ 437,370
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity	For purposes of the following table, the entire outstanding balance of these mortgage-backed securities issued by U.S. government corporations and agencies is categorized based on final maturity date. Debt Securities Available for Sale Held to Maturity (In thousands) Amortized Estimated Amortized Estimated Cost Fair Value Cost Fair Value Due in one year $ 2,413 $ 2,418 $ — $ — Due after one year through five years 10,584 10,798 1,246 1,260 Due after five years through ten years 18,130 18,624 23,944 23,899 Due after ten years 1,090,653 1,081,676 405,826 405,614 Totals $ 1,121,780 $ 1,113,516 $ 431,016 $ 430,773
Gross Unrealized Losses on Investment Securities	Gross unrealized losses on debt securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows: Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Value Loss Value Loss Value Loss March 31, 2019 (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 481 $ (2 ) $ 496,424 $ (6,674 ) $ 496,905 $ (6,676 ) Obligations of states and political subdivisions 24,644 (598 ) 566 (1 ) 25,210 (599 ) Asset backed securities 330,078 (4,318 ) — — 330,078 (4,318 ) Total debt securities available for sale $ 355,203 $ (4,918 ) $ 496,990 $ (6,675 ) $ 852,193 $ (11,593 ) Debt Securities Held to Maturity Obligations of U.S. government agencies $ — $ — $ 224,551 $ (2,581 ) $ 224,551 $ (2,581 ) Obligations of states and political subdivisions — — 5,891 (25 ) 5,891 (25 ) Total debt securities held to maturity $ — $ — $ 230,442 $ (2,606 ) $ 230,442 $ (2,606 ) Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Value Loss Value Loss Value Loss December 31, 2018 (in thousands) Debt Securities Available for Sale Obligations of U.S. government agencies $ 171,309 $ (3,588 ) $ 394,630 $ (14,490 ) $ 565,939 $ (18,078 ) Obligations of states and political subdivisions 63,738 (1,541 ) 20,719 (1,571 ) 84,457 (3,112 ) Asset backed securities 101,386 (1,019 ) — — 101,386 (1,019 ) Total debt securities available for sale $ 336,433 $ (6,148 ) $ 415,349 $ (16,061 ) $ 751,782 $ (22,209 ) Debt Securities Held to Maturity Obligations of U.S. government agencies $ 223,810 $ (2,619 ) $ 158,648 $ (5,126 ) $ 382,458 $ (7,745 ) Obligations of states and political subdivisions 5,786 (114 ) 4,042 (116 ) 9,828 (230 ) Total debt securities held to maturity $ 229,596 $ (2,733 ) $ 162,690 $ (5,242 ) $ 392,286 $ (7,975 )

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Summary of Loan Balances	A summary of loan balances follows (in thousands): March 31, 2019 Originated PNCI PCI Total Mortgage loans on real estate: Residential 1-4 family $ 357,559 $ 163,268 $ 1,585 $ 522,412 Commercial 1,929,508 671,397 6,022 2,606,927 Total mortgage loan on real estate 2,287,067 834,665 7,607 3,129,339 Consumer: Home equity lines of credit 279,075 38,090 1,088 318,253 Home equity loans 31,245 3,356 436 35,037 Other 45,020 20,001 41 65,062 Total consumer loans 355,340 61,447 1,565 418,352 Commercial 227,314 39,295 2,554 269,163 Construction: Residential 115,688 30,096 — 145,784 Commercial 64,576 7,117 — 71,693 Total construction 180,264 37,213 — 217,477 Total loans, net of deferred loan fees and discounts $ 3,049,985 $ 972,620 $ 11,726 $ 4,034,331 Total principal balance of loans owed, net of charge-offs $ 3,059,398 $ 1,007,678 $ 18,376 $ 4,085,452 Unamortized net deferred loan fees (9,413 ) — — (9,413 ) Discounts to principal balance of loans owed, net of charge-offs — (35,058 ) (6,650 ) (41,708 ) Total loans, net of unamortized deferred loan fees and discounts $ 3,049,985 $ 972,620 $ 11,726 $ 4,034,331 Allowance for loan losses $ (31,088 ) $ (969 ) $ (7 ) $ (32,064 ) December 31, 2018 Originated PNCI PCI Total Mortgage loans on real estate: Residential 1-4 family $ 343,796 $ 169,792 $ 1,674 $ 515,262 Commercial 1,910,981 708,401 8,456 2,627,838 Total mortgage loan on real estate 2,254,777 878,193 10,130 3,143,100 Consumer: Home equity lines of credit 284,453 40,957 1,167 326,577 Home equity loans 32,660 3,585 439 36,684 Other 34,020 21,659 42 55,721 Total consumer loans 351,133 66,201 1,648 418,982 Commercial 228,635 45,468 2,445 276,548 Construction: Residential 90,703 30,593 — 121,296 Commercial 56,208 5,880 — 62,088 Total construction 146,911 36,473 — 183,384 Total loans, net of deferred loan fees and discounts $ 2,981,456 $ 1,026,335 $ 14,223 $ 4,022,014 Total principal balance of loans owed, net of charge-offs $ 2,991,324 $ 1,062,655 $ 21,265 $ 4,075,244 Unamortized net deferred loan fees (9,868 ) — — (9,868 ) Discounts to principal balance of loans owed, net of charge-offs — (36,320 ) (7,042 ) (43,362 ) Total loans, net of unamortized deferred loan fees and discounts $ 2,981,456 $ 1,026,335 $ 14,223 $ 4,022,014 Allowance for loan losses $ (31,793 ) $ (667 ) $ (122 ) $ (32,582 )
Change in Accretable Yield for PCI	The following is a summary of the change in accretable yield for PCI during the periods indicated (in thousands): Three months ended March 31, 2019 2018 Change in accretable yield: Balance at beginning of period $ 6,059 $ 6,137 Accretion to interest income (301 ) (255 ) Reclassification (to) from nonaccretable difference (11 ) 140 Balance at end of period $ 5,747 $ 6,022

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Summary of Activity in Allowance for Loan Losses, and Ending Balance of Loans, Net of Unearned Fees for Periods Indicated	The following tables summarize the activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated. Allowance for Loan Losses – Three Months Ended March 31, 2019 (in thousands) Beginning Balance Charge-offs Recoveries Provision (benefit) Ending Balance Mortgage loans on real estate: Residential 1-4 family $ 2,676 $ — $ 2 $ (178 ) $ 2,500 Commercial 12,944 — 1,381 (1,995 ) 12,330 Total mortgage loans on real estate 15,620 — 1,383 (2,173 ) 14,830 Consumer: Home equity lines of credit 6,042 — 95 (122 ) 6,015 Home equity loans 1,540 — 87 (341 ) 1,286 Other 793 (207 ) 75 379 1,040 Total consumer loans 8,375 (207 ) 257 (84 ) 8,341 Commercial 6,090 (519 ) 168 339 6,078 Construction: Residential 1,834 — — 574 2,408 Commercial 663 — — (256 ) 407 Total construction 2,497 — — 318 2,815 Total $ 32,582 $ (726 ) $ 1,808 $ (1,600 ) $ 32,064 Allowance for Loan Losses – As of March 31, 2019 (in thousands) Loans pooled for evaluation Individually evaluated for impairment Loans acquired with deteriorated credit quality Total allowance for loan losses Mortgage loans on real estate: Residential 1-4 family $ 2,445 $ 55 $ — $ 2,500 Commercial 12,293 36 1 12,330 Total mortgage loans on real estate 14,738 91 1 14,830 Consumer: Home equity lines of credit 5,879 130 6 6,015 Home equity loans 1,216 70 — 1,286 Other 1,023 17 — 1,040 Total consumer loans 8,118 217 6 8,341 Commercial 4,636 1,442 — 6,078 Construction: Residential 2,408 — — 2,408 Commercial 407 — — 407 Total construction 2,815 — — 2,815 Total $ 30,307 $ 1,750 $ 7 $ 32,064 Loans, Net of Unearned fees – As of March 31, 2019 (in thousands) Loans pooled for evaluation Individually evaluated for impairment Loans acquired with deteriorated credit quality Total loans, net of unearned fees Mortgage loans on real estate: Residential 1-4 family $ 517,038 $ 3,789 $ 1,585 $ 522,412 Commercial 2,592,994 7,911 6,022 2,606,927 Total mortgage loans on real estate 3,110,032 11,700 7,607 3,129,339 Consumer: Home equity lines of credit 314,609 2,556 1,088 318,253 Home equity loans 32,618 1,983 436 35,037 Other 64,891 130 41 65,062 Total consumer loans 412,118 4,669 1,565 418,352 Commercial 261,933 4,676 2,554 269,163 Construction: Residential 145,784 — — 145,784 Commercial 71,693 — — 71,693 Total construction 217,477 — — 217,477 Total $ 4,001,560 $ 21,045 $ 11,726 $ 4,034,331 Allowance for Loan Losses – Year Ended December 31, 2018 (in thousands) Beginning Charge-offs Recoveries Provision Ending Mortgage loans on real estate: Residential 1-4 family $ 2,317 $ (77 ) $ — $ 436 $ 2,676 Commercial 11,441 (15 ) 68 1,450 12,944 Total mortgage loans on real estate 13,758 (92 ) 68 1,886 15,620 Consumer: Home equity lines of credit 5,800 (277 ) 846 (327 ) 6,042 Home equity loans 1,841 (24 ) 297 (574 ) 1,540 Other 586 (783 ) 288 702 793 Total consumer loans 8,227 (1,084 ) 1,431 (199 ) 8,375 Commercial 6,512 (1,188 ) 541 225 6,090 Construction: Residential 1,184 — — 650 1,834 Commercial 642 — — 21 663 Total construction 1,826 — — 671 2,497 Total $ 30,323 $ (2,364 ) $ 2,040 $ 2,583 $ 32,582 Allowance for Loan Losses – As of December 31, 2018 (in thousands) Loans pooled Individually Loans acquired Total allowance Mortgage loans on real estate: Residential 1-4 family $ 2,620 $ 56 $ — $ 2,676 Commercial 12,737 91 116 12,944 Total mortgage loans on real estate 15,357 147 116 15,620 Consumer: Home equity lines of credit 5,838 198 6 6,042 Home equity loans 1,486 54 — 1,540 Other 779 14 — 793 Total consumer loans 8,103 266 6 8,375 Commercial 4,309 1,781 — 6,090 Construction: Residential 1,834 — — 1,834 Commercial 663 — — 663 Total construction 2,497 — — 2,497 Total $ 30,266 $ 2,194 $ 122 $ 32,582 Loans, Net of Unearned fees – As of December 31, 2018 (in thousands) Loans pooled for evaluation Individually evaluated for impairment Loans acquired with deteriorated credit quality Total loans, net of unearned fees Mortgage loans on real estate: Residential 1-4 family $ 509,267 $ 4,321 $ 1,674 $ 515,262 Commercial 2,606,819 12,563 8,456 2,627,838 Total mortgage loans on real estate 3,116,086 16,884 10,130 3,143,100 Consumer: Home equity lines of credit 322,764 2,646 1,167 326,577 Home equity loans 33,142 3,103 439 36,684 Other 55,483 196 42 55,721 Total consumer loans 411,389 5,945 1,648 418,982 Commercial 268,885 5,218 2,445 276,548 Construction: Residential 121,296 — — 121,296 Commercial 62,088 — — 62,088 Total construction 183,384 — — 183,384 Total $ 3,979,744 $ 28,047 $ 14,223 $ 4,022,014 Allowance for Loan Losses – Three Months Ended March 31, 2018 (in thousands) Beginning Charge-offs Recoveries Provision Ending Balance Mortgage loans on real estate: Residential 1-4 family $ 2,317 $ (1 ) $ — $ (146 ) $ 2,170 Commercial 11,441 — 15 39 11,495 Total mortgage loans on real estate 13,758 (1 ) 15 (107 ) 13,665 Consumer: Home equity lines of credit 5,800 (80 ) 209 (517 ) 5,412 Home equity loans 1,841 — 14 (119 ) 1,736 Other 586 (194 ) 78 100 570 Total consumer loans 8,227 (274 ) 301 (536 ) 7,718 Commercial 6,512 (205 ) 50 35 6,392 Construction: Residential 1,184 — — 167 1,351 Commercial 642 — — 205 847 Total construction 1,826 — — 372 2,198 Total $ 30,323 $ (480 ) $ 366 $ (236 ) $ 29,973 Allowance for Loan Losses – As of March 31, 2018 (in thousands) Loans pooled for evaluation Individually evaluated for impairment Loans acquired with deteriorated credit quality Total allowance for loan losses Mortgage loans on real estate: Residential 1-4 family $ 1,910 $ 190 $ 70 $ 2,170 Commercial 11,281 154 60 11,495 Total mortgage loans on real estate 13,191 344 130 13,665 Consumer: Home equity lines of credit 4,956 448 8 5,412 Home equity loans 1,606 130 — 1,736 Other 514 56 — 570 Total consumer loans 7,076 634 8 7,718 Commercial 4,249 2,113 30 6,392 Construction: Residential 1,351 — — 1,351 Commercial 847 — — 847 Total construction 2,198 — — 2,198 Total $ 26,714 $ 3,091 $ 168 $ 29,973 Loans, Net of Unearned fees – As of March 31, 2018 (in thousands) Loans pooled for evaluation Individually evaluated for impairment Loans acquired with deteriorated credit quality Total loans, net Mortgage loans on real estate: Residential 1-4 family $ 378,832 $ 5,535 $ 1,744 $ 386,111 Commercial 1,954,120 11,110 8,038 1,973,268 Total mortgage loans on real estate 2,332,952 16,645 9,782 2,359,379 Consumer: Home equity lines of credit 279,140 2,450 1,661 283,251 Home equity loans 39,774 1,673 485 41,932 Other 23,285 278 43 23,606 Total consumer loans 342,199 4,401 2,189 348,789 Commercial 208,889 4,621 2,505 216,015 Construction: Residential 71,462 136 — 71,598 Commercial 73,952 — — 73,952 Total construction 145,414 136 — 145,550 Total $ 3,029,454 $ 25,803 $ 14,476 $ 3,069,733
Schedule Credit Quality Indicators	The following tables present ending loan balances by loan category and risk grade for the periods indicated: Credit Quality Indicators Originated Loans– As of March 31, 2019 (in thousands) Pass Special Mention Substandard Doubtful / Loss Total Originated Loans Mortgage loans on real estate: Residential 1-4 family $ 350,256 $ 1,807 $ 5,496 $ — $ 357,559 Commercial 1,886,958 33,094 9,456 — 1,929,508 Total mortgage loans on real estate 2,237,214 34,901 14,952 — 2,287,067 Consumer: Home equity lines of credit 273,144 2,867 3,064 — 279,075 Home equity loans 27,328 1,533 2,384 — 31,245 Other 44,611 309 100 — 45,020 Total consumer loans 345,083 4,709 5,548 — 355,340 Commercial 214,758 7,896 4,660 — 227,314 Construction: Residential 115,432 — 256 — 115,688 Commercial 64,238 338 — — 64,576 Total construction 179,670 338 256 — 180,264 Total loans $ 2,976,725 $ 47,844 $ 25,416 $ — $ 3,049,985 Credit Quality Indicators PNCI Loans – As of March 31, 2019 (in thousands) Pass Special Mention Substandard Doubtful / Loss Total PNCI Loans Mortgage loans on real estate: Residential 1-4 family $ 161,351 $ 1,109 $ 808 $ — $ 163,268 Commercial 665,630 2,727 3,040 — 671,397 Total mortgage loans on real estate 826,981 3,836 3,848 — 834,665 Consumer: Home equity lines of credit 35,888 925 1,277 — 38,090 Home equity loans 3,174 98 84 — 3,356 Other 19,790 208 3 — 20,001 Total consumer loans 58,852 1,231 1,364 — 61,447 Commercial 38,762 201 332 — 39,295 Construction: Residential 30,096 — — — 30,096 Commercial 6,872 — 245 — 7,117 Total construction 36,968 — 245 — 37,213 Total loans $ 961,563 $ 5,268 $ 5,789 $ — $ 972,620 Credit Quality Indicators Originated Loans– As of December 31, 2018 (in thousands) Pass Special Mention Substandard Doubtful / Loss Total Originated Loans Mortgage loans on real estate: Residential 1-4 family $ 337,189 $ 1,724 $ 4,883 $ — $ 343,796 Commercial 1,861,627 33,483 15,871 — 1,910,981 Total mortgage loans on real estate 2,198,816 35,207 20,754 — 2,254,777 Consumer: Home equity lines of credit 279,491 2,309 2,653 — 284,453 Home equity loans 29,289 1,054 2,317 — 32,660 Other 33,606 341 73 — 34,020 Total consumer loans 342,386 3,704 5,043 — 351,133 Commercial 217,126 6,127 5,382 — 228,635 Construction: Residential 90,412 32 259 — 90,703 Commercial 55,863 345 — — 56,208 Total construction 146,275 377 259 — 146,911 Total loans $ 2,904,603 $ 45,415 $ 31,438 $ — $ 2,981,456 Credit Quality Indicators PNCI Loans – As of December 31, 2018 (in thousands) Pass Special Mention Substandard Doubtful / Loss Total PNCI Loans Mortgage loans on real estate: Residential 1-4 family $ 167,908 $ 1,086 $ 798 $ — $ 169,792 Commercial 701,868 3,085 3,448 — 708,401 Total mortgage loans on real estate 869,776 4,171 4,246 — 878,193 Consumer: Home equity lines of credit 38,780 1,124 1,053 — 40,957 Home equity loans 3,413 74 98 — 3,585 Other 21,481 173 5 — 21,659 Total consumer loans 63,674 1,371 1,156 — 66,201 Commercial 45,027 321 120 — 45,468 Construction: Residential 30,593 — — — 30,593 Commercial 5,880 — — — 5,880 Total construction 36,473 — — — 36,473 Total $ 1,014,950 $ 5,863 $ 5,522 $ — $ 1,026,335
Analysis of Past Due Loans	The following table shows the ending balance of current and past due originated loans by loan category as of the date indicated: Analysis of Originated Past Due Loans - As of March 31, 2019 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ 2,231 $ — $ 396 $ 2,627 $ 354,932 $ 357,559 $ — Commercial 767 — 901 1,668 1,927,840 1,929,508 — Total mortgage loans on real estate 2,998 — 1,297 4,295 2,282,772 2,287,067 — Consumer: Home equity lines of credit 1,774 11 362 2,147 276,928 279,075 — Home equity loans 512 24 163 699 30,546 31,245 17 Other 151 — 9 160 44,860 45,020 9 Total consumer loans 2,437 35 534 3,006 352,334 355,340 26 Commercial 1,122 453 371 1,946 225,368 227,314 14 Construction: Residential 785 — — 785 114,903 115,688 — Commercial — — — — 64,576 64,576 — Total construction 785 — — 785 179,479 180,264 — Total originated loans $ 7,342 $ 488 $ 2,202 $ 10,032 $ 3,039,953 $ 3,049,985 $ 40 The following table shows the ending balance of current and past due PNCI loans by loan category as of the date indicated: Analysis of PNCI Past Due Loans - As of March 31, 2019 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ 1,457 $ 270 $ — $ 1,727 $ 161,541 $ 163,268 $ — Commercial 2,898 — 949 3,847 667,550 671,397 — Total mortgage loans on real estate 4,355 270 949 5,574 829,091 834,665 — Consumer: Home equity lines of credit 418 — 1 419 37,671 38,090 — Home equity loans 14 — — 14 3,342 3,356 — Other 151 — — 151 19,850 20,001 — Total consumer loans 583 — 1 584 60,863 61,447 — Commercial 2 99 233 334 38,961 39,295 — Construction: Residential — — — — 30,096 30,096 — Commercial — — — — 7,117 7,117 — Total construction — — — — 37,213 37,213 — Total PNCI loans $ 4,940 $ 369 $ 1,183 $ 6,492 $ 966,128 $ 972,620 $ — The following table shows the ending balance of current and past due originated loans by loan category as of the date indicated: Analysis of Originated Past Due Loans - As of December 31, 2018 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ 1,675 $ 132 $ 478 $ 2,285 $ 341,511 $ 343,796 $ — Commercial 431 1,200 296 1,927 1,909,054 1,910,981 — Total mortgage loans on real estate 2,106 1,332 774 4,212 2,250,565 2,254,777 — Consumer: Home equity lines of credit 908 47 609 1,564 282,889 284,453 — Home equity loans 1,043 24 214 1,281 31,379 32,660 — Other 298 17 — 315 33,705 34,020 — Total consumer loans 2,249 88 823 3,160 347,973 351,133 — Commercial 1,053 579 1,247 2,879 225,756 228,635 — Construction: Residential 209 — — 209 90,494 90,703 — Commercial — — — — 56,208 56,208 — Total construction 209 — — 209 146,702 146,911 — Total loans $ 5,617 $ 1,999 $ 2,844 $ 10,460 $ 2,970,996 $ 2,981,456 $ — The following table shows the ending balance of current and past due PNCI loans by loan category as of the date indicated: Analysis of PNCI Past Due Loans - As of December 31, 2018 (in thousands) 30-59 days 60-89 days > 90 days Total Past Current Total > 90 Days and Mortgage loans on real estate: Residential 1-4 family $ 1,009 $ 133 $ 156 $ 1,298 $ 168,494 $ 169,792 $ — Commercial 1,646 1,136 1,082 3,864 704,537 708,401 — Total mortgage loans on real estate 2,655 1,269 1,238 5,162 873,031 878,193 — Consumer: Home equity lines of credit 304 35 237 576 40,381 40,957 — Home equity loans 74 — — 74 3,511 3,585 — Other 160 — — 160 21,499 21,659 — Total consumer loans 538 35 237 810 65,391 66,201 — Commercial 678 145 113 936 44,532 45,468 — Construction: Residential — — — — 30,593 30,593 — Commercial — — — — 5,880 5,880 — Total construction — — — — 36,473 36,473 — Total loans $ 3,871 $ 1,449 $ 1,588 $ 6,908 $ 1,019,427 $ 1,026,335 $ —
Schedule of Non Accrual Loans	The following table shows the ending balance of nonaccrual originated and PNCI loans by loan category as of the date indicated: Non Accrual Loans As of March 31, 2019 As of December 31, 2018 (in thousands) Originated PNCI Total Originated PNCI Total Mortgage loans on real estate: Residential 1-4 family $ 3,066 $ 308 $ 3,374 $ 3,244 $ 334 $ 3,578 Commercial 4,493 1,445 5,938 9,263 1,468 10,731 Total mortgage loans on real estate 7,559 1,753 9,312 12,507 1,802 14,309 Consumer: Home equity lines of credit 1,366 501 1,867 1,429 885 2,314 Home equity loans 1,599 36 1,635 1,722 47 1,769 Other 28 4 32 3 4 7 Total consumer loans 2,993 541 3,534 3,154 936 4,090 Commercial 3,144 332 3,476 3,755 120 3,875 Construction: Residential — — — — — — Commercial — — — — — — Total construction — — — — — — Total non accrual loans $ 13,696 $ 2,626 $ 16,322 $ 19,416 $ 2,858 $ 22,274
Impaired Loans	The following tables show the recorded investment (financial statement balance), unpaid principal balance, average recorded investment, and interest income recognized for impaired Originated and PNCI loans, segregated by those with no related allowance recorded and those with an allowance recorded for the periods indicated. Impaired Originated Loans – As of, or for the Three Months Ended, March 31, 2019 (in thousands) Unpaid principal balance Recorded investment with no related allowance Recorded investment with related allowance Total recorded investment Related Allowance Average recorded investment Interest income recognized Mortgage loans on real estate: Residential 1-4 family $ 4,148 $ 3,481 $ — $ 3,481 $ 55 $ 4,029 $ 6 Commercial 6,771 5,874 592 6,466 37 9,453 22 Total mortgage loans on real estate 10,919 9,355 592 9,947 92 13,482 28 Consumer: Home equity lines of credit 1,857 1,737 58 1,795 18 1,943 4 Home equity loans 2,333 1,639 120 1,759 20 1,963 — Other 46 — 28 28 9 33 — Total consumer loans 4,236 3,376 206 3,582 47 3,939 4 Commercial 4,538 2,301 2,043 4,344 1,223 4,778 — Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total $ 19,693 $ 15,032 $ 2,841 $ 17,873 $ 1,362 $ 22,199 $ 32 Impaired PNCI Loans – As of, or for the Three Months Ended, March 31, 2019 (in thousands) Unpaid principal balance Recorded investment with no related allowance Recorded investment with related allowance Total recorded investment Related Allowance Average recorded investment Interest income recognized Mortgage loans on real estate: Residential 1-4 family $ 344 $ 308 $ — $ 308 $ — $ 321 $ — Commercial 3,089 1,445 — 1,445 — 1,456 58 Total mortgage loans on real estate 3,433 1,753 — 1,753 — 1,777 58 Consumer: Home equity lines of credit 831 401 360 761 112 883 — Home equity loans 242 102 122 224 50 232 — Other 102 64 38 102 7 106 — Total consumer loans 1,175 567 520 1,087 169 1,221 — Commercial 335 113 219 332 219 226 2 Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total $ 4,943 $ 2,433 $ 739 $ 3,172 $ 388 $ 3,224 $ 60 Impaired Originated Loans – As of, or for the Twelve Months Ended, December 31, 2018 (in thousands) Unpaid principal balance Recorded investment with no related allowance Recorded investment with related allowance Total recorded investment Related Allowance Average recorded investment Interest income recognized Mortgage loans on real estate: Residential 1-4 family $ 4,594 $ 3,663 $ 308 $ 3,971 $ 56 $ 3,517 $ 90 Commercial 13,081 10,676 1,765 12,441 42 13,115 137 Total mortgage loans on real estate 17,675 14,339 2,073 16,412 98 16,632 227 Consumer: Home equity lines of credit 1,900 1,749 111 1,860 71 1,885 43 Home equity loans 2,374 1,892 65 1,957 2 1,520 23 Other 3 — 3 3 3 17 2 Total consumer loans 4,277 3,641 179 3,820 76 3,422 68 Commercial 5,433 2,924 2,287 5,211 1,774 4,654 91 Construction: Residential — — — — — 5 — Commercial — — — — — — — Total construction — — — — — 5 — Total $ 27,385 $ 20,904 $ 4,539 $ 25,443 $ 1,948 $ 24,713 $ 386 Impaired PNCI Loans – As of, or for the Twelve Months Ended, December 31, 2018 (in thousands) Unpaid principal balance Recorded investment with no related allowance Recorded investment with related allowance Total recorded investment Related Allowance Average recorded investment Interest income recognized Mortgage loans on real estate: Residential 1-4 family $ 375 $ 334 $ — $ 334 $ — $ 529 $ 5 Commercial 3,110 1,468 — 1,468 — 1,713 183 Total mortgage loans on real estate 3,485 1,802 — 1,802 — 2,242 188 Consumer: Home equity lines of credit 1,027 587 367 954 127 1,120 18 Home equity loans 252 47 197 244 101 155 — Other 106 21 85 106 11 114 — Total consumer loans 1,385 655 649 1,304 239 1,389 18 Commercial 120 113 7 120 7 60 1 Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total $ 4,990 $ 2,570 $ 656 $ 3,226 $ 246 $ 3,691 $ 207 Impaired Originated Loans – As of, or for the Three Months Ended, March 31, 2018 (in thousands) Unpaid principal balance Recorded investment with no related allowance Recorded investment with related allowance Total recorded investment Related Allowance Average recorded investment Interest income recognized Mortgage loans on real estate: Residential 1-4 family $ 4,378 $ 2,678 $ 1,525 $ 4,203 $ 190 $ 4,071 $ 28 Commercial 11,407 9,848 1,262 11,110 154 12,510 44 Total mortgage loans on real estate 15,785 12,526 2,787 15,313 344 16,581 72 Consumer: Home equity lines of credit 1,478 888 527 1,415 146 1,455 10 Home equity loans 1,744 1,193 196 1,389 10 1,347 2 Other 4 — 4 4 4 6 — Total consumer loans 3,226 2,081 727 2,808 160 2,808 12 Commercial 4,756 881 3,740 4,621 2,113 4,545 26 Construction: Residential 136 136 — 136 — 138 2 Commercial — — — — — — — Total construction 136 136 — 136 — 138 2 Total $ 23,903 $ 15,624 $ 7,254 $ 22,878 $ 2,617 $ 24,072 $ 112 Impaired PNCI Loans – As of, or for the Three Months Ended, March 31, 2018 (in thousands) Unpaid principal balance Recorded investment with no related allowance Recorded investment with related allowance Total recorded investment Related Allowance Average recorded investment Interest income recognized Mortgage loans on real estate: Residential 1-4 family $ 1,390 $ 1,332 $ — $ 1,332 $ — $ 1,345 $ 2 Commercial — — — — — — — Total mortgage loans on real estate 1,390 1,332 — 1,332 — 1,345 2 Consumer: Home equity lines of credit 1,065 501 534 1,035 302 1,114 5 Home equity loans 298 40 244 284 120 225 3 Other 274 28 246 274 52 262 2 Total consumer loans 1,637 569 1,024 1,593 474 1,601 10 Commercial — — — — — — Construction: Residential — — — — — — — Commercial — — — — — — Total construction — — — — — — — Total $ 3,027 $ 1,901 $ 1,024 $ 2,925 $ 474 $ 2,946 $ 12
Troubled Debt Restructurings	The following tables show certain information regarding TDRs that occurred during the periods indicated: TDR Information for the Three Months Ended March 31, 2019 (dollars in thousands) Number Pre-mod outstanding principal balance Post-mod outstanding principal balance Financial impact due to TDR taken as additional provision Number that defaulted during the period Recorded investment of TDRs that defaulted during the period Financial impact due to the default of previous TDR taken as charge- offs or additional provisions Mortgage loans on real estate: Residential 1-4 family 1 $ 163 $ 162 $ — — $ — $ — Commercial — — — — — — — Total mortgage loans on real estate 1 163 162 — — — — Consumer: Home equity lines of credit — — — — — — — Home equity loans 1 121 120 1 — — — Other — — — — — — — Total consumer loans 1 121 120 1 — — — Commercial 2 15 15 — 1 7 — Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total 4 $ 299 $ 297 $ 1 1 $ 7 $ — TDR Information for the Three Months Ended March 31, 2018 (dollars in thousands) Number Pre-mod outstanding principal balance Post-mod outstanding principal balance Financial impact due to TDR taken as additional provision Number that defaulted during the period Recorded investment of TDRs that defaulted during the period Financial impact due to the default of previous TDR taken as charge- offs or additional provisions Mortgage loans on real estate: Residential 1-4 family — $ — $ — $ — — $ — $ — Commercial 1 384 384 11 1 169 — Total mortgage loans on real estate 1 384 384 11 1 169 — Consumer: Home equity lines of credit 1 133 138 — — — — Home equity loans 1 121 121 — — — — Other — — — — — — — Total consumer loans 2 254 259 — — — — Commercial — — — — — — — Construction: Residential — — — — — — — Commercial — — — — — — — Total construction — — — — — — — Total 3 $ 638 $ 643 $ 11 1 $ 169 $ —

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Lease Cost and Other Lease Information	The following table presents the components of lease expense for the three months ended March 31 2019: Three months ended (in thousands) March 31, 2019 Operating lease cost $ 1,311 Short-term lease cost 71 Variable lease cost (5 ) Sublease income (34 ) Total lease cost $ 1,343
Schedule Of Supplemental Cash Flow Information Related To Operating Leases [Table Text Block]	The following table presents supplemental cash flow information related to leases for the three months ended March 31, 2019: Three months ended (in thousands) March 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 1,218 ROUA obtained in exchange for operating lease liabilities $ 32,006
Schedule Of Weighted Average Lease Term And Discount Rate Related To Operating Lease [Table Text Block]	The following table presents the weighted average operating lease term and discount rate at March 31, 2019: As of March 31, 2019: Weighted-average remaining lease term 9.5 years Weighted-average discount rate 3.17 %
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	At March 31, 2019, future expected operating lease payments are as follows: (in thousands) Periods ending December 31, 2019 $ 3,519 2020 4,380 2021 4,226 2022 3,887 2023 3,208 Thereafter 16,455 35,675 Discount for present value of expected cash flows (5,471 ) Lease liability at March 31, 2019 $ 30,204

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2019
Banking and Thrift [Abstract]
Summary of Balances of Deposits	A summary of the balances of deposits follows (in thousands): March 31, December 31, 2019 2018 Noninterest-bearing demand $ 1,761,559 $ 1,760,580 Interest-bearing demand 1,297,672 1,252,366 Savings 1,925,168 1,921,324 Time certificates, $250,000 and above 135,716 132,429 Other time certificates 310,147 299,767 Total deposits $ 5,430,262 $ 5,366,466

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Summary of Bank's Commitments and Contingent Liabilities	(in thousands) March 31, 2019 December 31, 2018 Financial instruments whose amounts represent risk: Commitments to extend credit: Commercial loans $ 316,382 $ 306,191 Consumer loans 514,413 496,575 Real estate mortgage loans 163,733 140,292 Real estate construction loans 232,385 248,996 Standby letters of credit 11,743 11,346 Deposit account overdraft privilege 115,552 111,956

Stock Options and Other Equit_2

Stock Options and Other Equity-Based Incentive Instruments (Tables)	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Option Activity	Stock option activity during the three months ended March 31, 2019 is summarized in the following table: Number of Shares Option Price per Share Weighted Average Exercise Price Outstanding at December 31, 2018 343,000 $ 12.63 $ 16.67 Options granted — — — — Options exercised (41,000 ) $12.63 to $19.46 15.78 Options forfeited — — — — Outstanding at March 31, 2019 302,000 $14.54 to $23.21 $ 16.88
Summary of Options Outstanding	The following table shows the number, weighted-average exercise price, intrinsic value, and weighted average remaining contractual life of options exercisable, options not yet exercisable and total options outstanding as of March 31, 2019: Currently Exercisable Currently Not Exercisable Total Outstanding Number of options 300,875 1,125 302,000 Weighted average exercise price $ 16.86 $ 23.21 $ 16.88 Intrinsic value (in thousands) $ 5,095 $ 12 $ 5,107 Weighted average remaining contractual term (yrs.) 3.4 5.8 3.4
Restricted Stock Unit (RSU) Activity	Restricted stock unit (RSU) activity is summarized in the following table for the dates indicated: Service Market Plus Outstanding at December 31, 2018 66,947 45,536 RSUs granted — — RSUs added through dividend credits 322 — RSUs released (355 ) — RSUs forfeited/expired — — Outstanding at March 31, 2019 66,914 45,536

Noninterest Income and Expense

Noninterest Income and Expense (Tables)	3 Months Ended
	Mar. 31, 2019
Other Income and Expenses [Abstract]
Components of Other Noninterest Income	The following table summarizes the Company’s noninterest income for the periods indicated: Three months ended March 31, (dollars in thousands) 2019 2018 ATM and interchange fees $ 4,581 $ 4,235 Service charges on deposit accounts 3,880 3,779 Other service fees 771 714 Mortgage banking service fees 483 517 Change in value of mortgage servicing rights (645 ) 111 Total service charges and fees 9,070 9,356 Increase in cash value of life insurance 775 608 Asset management and commission income 642 876 Gain on sale of loans 412 626 Lease brokerage income 220 128 Sale of customer checks 140 101 Gain on sale of foreclosed assets 99 371 Gain (loss) on marketable equity securities 36 (48 ) Loss on disposal of fixed assets (38 ) (13 ) Other 508 285 Total other noninterest income 2,794 2,934 Total noninterest income $ 11,864 $ 12,290
Components of Noninterest Expense	The components of noninterest expense were as follows (in thousands): Three months ended March 31, 2019 2018 Base salaries, net of deferred loan origination costs $ 16,757 $ 13,962 Incentive compensation 2,567 2,452 Benefits and other compensation costs 5,804 5,238 Total salaries and benefits expense 25,128 21,652 Occupancy 3,774 2,681 Data processing and software 3,349 2,514 Equipment 1,867 1,551 Intangible amortization 1,431 339 Advertising 1,331 838 ATM and POS network charges 1,323 1,226 Professional fees 839 773 Telecommunications 797 701 Regulatory assessments and insurance 511 430 Merger and acquisition expense — 476 Postage 310 358 Operational losses 225 294 Courier service 270 267 Other miscellaneous expense 4,358 4,062 Total other noninterest expense 20,385 16,510 Total noninterest expense $ 45,513 $ 38,162

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Computation of Earnings Per Share	Earnings per share have been computed based on the following: Three months ended March 31, (in thousands) 2019 2018 Net income $ 22,726 $ 13,910 Average number of common shares outstanding 30,424 22,956 Effect of dilutive stock options and restricted stock 234 327 Average number of common shares outstanding used to calculate diluted earnings per share 30,658 23,283 Options excluded from diluted earnings per share because the effect of these options was antidilutive — —

Comprehensive Income (Tables)

Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Components of Other Comprehensive Income (Loss) and Related Tax Effects	The components of other comprehensive income (loss) and related tax effects are as follows: Three months ended March 31, (in thousands) 2019 2018 Unrealized holding gains (losses) on available for sale securities before reclassifications 12,710 $ (15,265 ) Amounts reclassified out of accumulated other comprehensive income: Adoption ASU 2016-01 — 62 Adoption ASU 2018-02 — (425 ) Total amounts reclassified out of accumulated other comprehensive income — (363 ) Unrealized holding gains (losses) on available for sale securities after reclassifications 12,710 (15,628 ) Tax effect (3,758 ) 4,602 Unrealized holding gains (losses) on available for sale securities, net of tax 8,952 (11,026 ) Change in unfunded status of the supplemental retirement plans before reclassifications (89 ) 667 Amounts reclassified out of accumulated other comprehensive income: Amortization of prior service cost (13 ) (13 ) Amortization of actuarial losses 102 127 Adoption ASU 2018-02 — (668 ) Total amounts reclassified out of accumulated other comprehensive income 89 (554 ) Change in unfunded status of the supplemental retirement plans after reclassifications — 113 Tax effect — (33 ) Change in unfunded status of the supplemental retirement plans, net of tax — 80 Total other comprehensive income (loss) $ 8,952 $ (10,946 )
Components of Accumulated Other Comprehensive Loss	The components of accumulated other comprehensive loss, included in shareholders’ equity, are as follows: (in thousands) March 31, 2019 December 31, 2018 Net unrealized loss on available for sale securities $ (8,264 ) $ (20,974 ) Tax effect 2,443 6,201 Unrealized holding loss on available for sale securities, net of tax (5,821 ) (14,773 ) Unfunded status of the supplemental retirement plans (4,802 ) (4,802 ) Tax effect 1,420 1,420 Unfunded status of the supplemental retirement plans, net of tax (3,382 ) (3,382 ) Joint beneficiary agreement liability 276 276 Tax effect — — Joint beneficiary agreement liability, net of tax 276 276 Accumulated other comprehensive loss $ (8,927 ) $ (17,879 )

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Recorded Amount of Assets and Liabilities Measured at Fair Value on Recurring Basis	The table below presents the recorded amount of assets and liabilities measured at fair value on a recurring basis (in thousands): Total Level 1 Level 2 Level 3 Fair value at March 31, 2019 Marketable equity securities $ 2,910 $ 2,910 $ — $ — Debt securities available for sale: Obligations of U.S. government corporations and agencies 627,100 — 627,100 — Obligations of states and political subdivisions 129,349 — 129,349 — Corporate bonds 4,478 — 4,478 — Asset backed securities 352,589 — 352,589 — Loans held for sale 5,410 — 5,410 — Mortgage servicing rights 6,572 — — 6,572 Total assets measured at fair value $ 1,128,408 $ 2,910 $ 1,118,926 $ 6,572 Total Level 1 Level 2 Level 3 Fair value at December 31 , 2018 Marketable equity securities $ 2,874 $ 2,874 $ — $ — Debt securities available for sale: Obligations of U.S. government corporations and agencies 629,981 — 629,981 — Obligations of states and political subdivisions 126,072 — 126,072 — Corporate bonds 4,478 — 4,478 — Asset backed securities 354,505 — 354,505 — Loans held for sale 3,687 — 3,687 — Mortgage servicing rights 7,098 — — 7,098 Total assets measured at fair value $ 1,128,695 $ 2,874 $ 1,118,723 $ 7,098
Reconciliation of Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) on Recurring Basis	The following table provides a reconciliation of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the time periods indicated. Had there been any transfer into or out of Level 3 during the time periods indicated, the amount included in the “Transfers into (out of) Level 3” column would represent the beginning balance of an item in the period (interim quarter) during which it was transferred (in thousands): Beginning Balance Transfers into (out of) Level 3 Change Included in Earnings Issuances Ending Balance Three months ended March 31 , 2019: Mortgage servicing rights $ 7,098 — $ (645 ) $ 119 $ 6,572 2018: Mortgage servicing rights $ 6,687 — $ 111 $ 155 $ 6,953
Quantitative Information about Recurring Level 3 Fair Value Measurements	The following table presents quantitative information about recurring Level 3 fair value measurements at March 31, 2019 and December 31, 2018: Fair Value (in thousands) Valuation Technique Unobservable Inputs Range, Weighted Average As of March 31, 2019: Mortgage Servicing Rights $ 6,572 Discounted Constant 5.4% - 27.1%; 8.9% Discount rate 12% - 13%; 12% As of December 31, 2018: Mortgage Servicing Rights $ 7,098 Discounted Constant 5.0% - 27.3%; 7.6% Discount rate 12% - 13%; 12%
Assets and Liabilities Measured at Fair Value on Nonrecurring Basis	The tables below present the recorded investment in assets and liabilities measured at fair value on a nonrecurring basis, as of the dates indicated (in thousands): Total Level 1 Level 2 Level 3 Total Gains (Losses) Three months ended March 31, 2019 Fair value: Impaired Originated & PNCI loans $ 212 — — $ 212 $ (197 ) Foreclosed assets 214 — — 214 98 Total assets measured at fair value $ 426 — — $ 426 $ (99 ) Total Level 1 Level 2 Level 3 Total Gains (Losses) Year ended December 31, 2018 Fair value: Impaired Originated & PNCI loans $ 281 — — $ 281 $ (294 ) Foreclosed assets 1,311 — — 1,311 (8 ) Total assets measured at fair value $ 1,592 — — $ 1,592 $ (302 ) Total Level 1 Level 2 Level 3 Total Gains (Losses) Three months ended March 31, 2018 Fair value: Impaired Originated & PNCI loans $ 2,103 — — $ 2,103 $ (795 ) Foreclosed assets 774 — — 774 (87 ) Total assets measured at fair value $ 2,877 — — $ 2,877 $ (882 )
Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Nonrecurring Basis	The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at March 31, 2019: Fair Value (in thousands) Valuation Technique Unobservable Inputs Range, Weighted Average March 31, 2019 Impaired Originated & PNCI loans $ 212 Sales comparison approach Adjustment for differences between comparable sales Not meaningful Income approach Capitalization rate N/A Foreclosed assets (Residential real estate) $ 214 Sales comparison approach Adjustment for differences between comparable sales Not meaningful The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at December 31, 2018: Fair Value (in thousands) Valuation Technique Unobservable Inputs Range, Weighted Average December 31, 2018 Impaired Originated & PNCI loans $ 281 Sales comparison approach Adjustment for differences between comparable sales (16.3%) - 35.14%; % Income approach Capitalization rate N/A Foreclosed assets (Residential real estate) $ 693 Sales comparison approach Adjustment for differences between comparable sales (21.83%) - 7.25%; (3.75%) Foreclosed assets (Commercial real estate) $ 618 Sales comparison approach Adjustment for differences between comparable sales (65%) - 20%; (45%)
Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets	March 31, 2019 December 31, 2018 (in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Financial assets: Level 1 inputs: Cash and due from banks $ 105,103 $ 105,103 $ 119,781 $ 119,781 Cash at Federal Reserve and other banks 213,605 213,605 107,752 107,752 Level 2 inputs: Securities held to maturity 431,016 430,773 444,936 437,370 Restricted equity securities 17,250 N/A 17,250 N/A Loans held for sale 5,410 5,410 3,687 4,616 Level 3 inputs: Loans, net 4,002,267 4,053,496 3,989,432 4,006,986 Financial liabilities: Level 2 inputs: Deposits 5,430,262 5,427,004 5,366,466 5,362,173 Other borrowings 12,466 12,466 15,839 15,839 Level 3 inputs: Junior subordinated debt 57,085 56,180 57,042 62,610 (in thousands) Contract Amount Fair Value Contract Amount Fair Value Off-balance sheet: Level 3 inputs: Commitments $ 1,226,913 $ 12,269 $ 1,192,054 $ 11,921 Standby letters of credit 11,743 117 11,346 113 Overdraft privilege commitments 115,552 1,156 111,956 1,120

Regulatory Matters (Tables)

Regulatory Matters (Tables)	3 Months Ended
	Mar. 31, 2019
Banking and Thrift [Abstract]
Actual and Required Capital Ratios of Bank	The following tables present actual and required capital ratios as of March 31, 2019 and December 31, 2018 for the Company and the Bank under applicable Basel III Capital Rules. The minimum capital amounts presented include the minimum required capital levels as of March 31, 2019 and December 31, 2018 based on the then provisions of the Basel III Capital Rules. As of January 1, 2019, the minimum required capital levels of the Basel III Capital Rules have been fully Capital levels required to be considered well capitalized are based upon prompt corrective action regulations, as amended to reflect the changes under the Basel III Capital Rules. Minimum Capital Required to be Required – Basel III Considered Well Actual Fully Phased In Capitalized Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) As of March 31, 2019: Total Capital (to Risk Weighted Assets): Consolidated $ 700,542 14.73 % $ 449,380 10.50 % N/A N/A Tri Counties Bank $ 697,549 14.67 % $ 499,195 10.50 % $ 475,424 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 665,688 14.00 % $ 404,260 8.50 % N/A N/A Tri Counties Bank $ 662,695 13.94 % $ 404,111 8.50 % $ 380,339 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 610,317 12.83 % $ 332,920 7.00 % N/A N/A Tri Counties Bank $ 662,695 13.94 % $ 332,797 7.00 % $ 309,026 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 665,688 10.84 % $ 245,649 4.00 % N/A N/A Tri Counties Bank $ 662,695 10.79 % $ 245,643 4.00 % $ 307,054 5.00 % Minimum Capital Minimum Capital Required to be Required – Basel III Required – Basel III Considered Well Actual Phase-in Schedule Fully Phased In Capitalized Amount Ratio Amount Ratio Amount Ratio Amount Ratio (dollars in thousands) As of December 31, 2018: Total Capital (to Risk Weighted Assets): Consolidated $ 682,419 14.40 % $ 467,874 9.875 % $ 497,486 10.50 % N/A N/A Tri Counties Bank $ 680,624 14.37 % $ 467,704 9.875 % $ 497,305 10.50 % $ 473,624 10.00 % Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 647,262 13.66 % $ 373,115 7.875 % $ 402,727 8.50 % N/A N/A Tri Counties Bank $ 645,467 13.63 % $ 372,979 7.875 % $ 402,581 8.50 % $ 378,899 8.00 % Common equity Tier 1 Capital (to Risk Weighted Assets): Consolidated $ 591,933 12.49 % $ 302,045 6.375 % $ 331,658 7.00 % N/A N/A Tri Counties Bank $ 645,467 13.63 % $ 301,935 6.375 % $ 331,537 7.00 % $ 307,856 6.50 % Tier 1 Capital (to Average Assets): Consolidated $ 647,262 10.68 % $ 242,452 4.000 % $ 242,452 4.00 % N/A N/A Tri Counties Bank $ 645,467 10.65 % $ 242,447 4.000 % $ 242,447 4.00 % $ 303,059 5.00 %

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019USD ($)TrustOfficeSegmentBusiness
Significant Of Accounting Policies [Line Items]
Number of subsidiary business trusts | Trust	5
Number of loan production offices | Office	2
Company's investments in the trusts | $	$ 1,714,000
Number of business segment | Segment	1
Loans contractual past due	90 days
California [Member]
Significant Of Accounting Policies [Line Items]
Number of counties | Business	29

Business Combinations - Additio

Business Combinations - Additional Information (Detail)	Jul. 06, 2018USD ($)Branchesshares	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)
Business Acquisition [Line Items]
Goodwill recognized		$ 220,972,000		$ 220,972,000
PNCI [Member]
Business Acquisition [Line Items]
Receivables gross contractual amount		866,189,000
Receivables fair value		833,381,000
PCI [Member]
Business Acquisition [Line Items]
Receivables gross contractual amount		1,683,000
Receivables fair value		1,302,000
FNBB [Member]
Business Acquisition [Line Items]
Total consideration value	$ 291,132,000
Issue of common stock shares | shares	7,405,277
Amount paid in exchange for the outstanding options	$ 6,700,000
Number of branches added | Branches	12
Goodwill recognized	$ 156,661,000
Recognized intangible related to acquisition	27,605,000
FNBB [Member] | Core Deposit Intangibles [Member]
Business Acquisition [Line Items]
Recognized intangible related to acquisition	$ 27,605,000
Finite lived intangible asset estimated useful life	6 years 2 months 12 days
Acquisition related costs		$ 0	$ 476,000

Business Combinations - Schedul

Business Combinations - Schedule of Fair Value of Consideration Transferred, Identifiable Net Assets Acquired and Resulting Goodwill (Detail) - USD ($) $ in Thousands	Jul. 06, 2018	Mar. 31, 2019	Dec. 31, 2018
Liabilities assumed:
Goodwill recognized		$ 220,972	$ 220,972
FNBB [Member]
Fair value of consideration transferred:
Fair value of shares issued	$ 284,437
Cash consideration	6,695
Total fair value of consideration transferred	291,132
Assets acquired:
Cash and cash equivalents	37,308
Securities available for sale	335,667
Restricted equity securities	7,723
Loans	834,683
Premises and equipment	30,522
Cash value of life insurance	16,817
Core deposit intangible	27,605
Other assets	16,214
Total assets acquired	1,306,539
Liabilities assumed:
Deposits	991,935
Other liabilities	15,133
Total liabilities assumed	1,172,068
Total net assets acquired	134,471
Goodwill recognized	156,661
FNBB [Member] | Federal Home Loan Bank of San Francisco [Member]
Liabilities assumed:
Short-term borrowings	$ 165,000

Business Combinations - Summary

Business Combinations - Summary of Estimated Fair Value Adjustments Resulting in Goodwill (Detail) - USD ($) $ in Thousands	Jul. 06, 2018	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 220,972	$ 220,972
FNBB [Member]
Business Acquisition [Line Items]
Value of stock consideration paid to FNB Bancorp Shareholders	$ 284,437
Cash consideration	6,695
Cost basis net assets acquired	114,030
Investments	(1,081)
Fair Value Adjustments, Premises and Equipment	21,590
Core deposit intangible	27,327
Deferred income taxes	(6,394)
Other	1,389
Goodwill	156,661
FNBB [Member] | Loans [Member]
Business Acquisition [Line Items]
Fair Value Adjustments	$ (22,390)

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Amortized Cost	$ 1,121,780	$ 1,136,010
Debt Securities Available for Sale, Gross Unrealized Gains	3,329	1,235
Debt Securities Available for Sale, Gross Unrealized Losses	(11,593)	(22,209)
Debt Securities Available for Sale, Estimated Fair Value	1,113,516	1,115,036
Debt Securities Held to Maturity, Amortized Cost	431,016	444,936
Debt Securities Held to Maturity, Gross Unrealized Gains	2,363	409
Debt Securities Held to Maturity, Gross Unrealized Losses	(2,606)	(7,975)
Debt Securities Held to Maturity, Estimated Fair Value	430,773	437,370
Obligations of U.S. Government Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Amortized Cost	631,914	647,288
Debt Securities Available for Sale, Gross Unrealized Gains	1,862	771
Debt Securities Available for Sale, Gross Unrealized Losses	(6,676)	(18,078)
Debt Securities Available for Sale, Estimated Fair Value	627,100	629,981
Debt Securities Held to Maturity, Amortized Cost	416,418	430,343
Debt Securities Held to Maturity, Gross Unrealized Gains	2,190	327
Debt Securities Held to Maturity, Gross Unrealized Losses	(2,581)	(7,745)
Debt Securities Held to Maturity, Estimated Fair Value	416,027	422,925
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Amortized Cost	128,706	128,890
Debt Securities Available for Sale, Gross Unrealized Gains	1,242	294
Debt Securities Available for Sale, Gross Unrealized Losses	(599)	(3,112)
Debt Securities Available for Sale, Estimated Fair Value	129,349	126,072
Debt Securities Held to Maturity, Amortized Cost	14,598	14,593
Debt Securities Held to Maturity, Gross Unrealized Gains	173	82
Debt Securities Held to Maturity, Gross Unrealized Losses	(25)	(230)
Debt Securities Held to Maturity, Estimated Fair Value	14,746	14,445
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Amortized Cost	4,394	4,381
Debt Securities Available for Sale, Gross Unrealized Gains	84	97
Debt Securities Available for Sale, Estimated Fair Value	4,478	4,478
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Amortized Cost	356,766	355,451
Debt Securities Available for Sale, Gross Unrealized Gains	141	73
Debt Securities Available for Sale, Gross Unrealized Losses	(4,318)	(1,019)
Debt Securities Available for Sale, Estimated Fair Value	$ 352,589	$ 354,505

Investment Securities - Additio

Investment Securities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019USD ($)Investmentsecurities	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)
Investment Securities [Line Items]
Investment securities sold | $	$ 0	$ 0
Securities Pledged As Collateral | $	587,233,000		$ 597,591,000
Residential real estate mortgage-backed securities | $	$ 1,048,332,000
Life of mortgage-backed securities	5 years 6 months
Obligations of U.S. Government Agencies [Member]
Investment Securities [Line Items]
Available for sale securities in unrealized loss position | Investmentsecurities	93
Percentage of aggregate depreciation in unrealized losses	1.30%
Obligations of States and Political Subdivisions [Member]
Investment Securities [Line Items]
Available for sale securities in unrealized loss position | Investmentsecurities	33
Percentage of aggregate depreciation in unrealized losses	2.00%
Asset-backed Securities [Member]
Investment Securities [Line Items]
Available for sale securities in unrealized loss position | Investmentsecurities	28
Percentage of aggregate depreciation in unrealized losses	1.30%

Investment Securities - Amort_2

Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Due in one year, Amortized Cost	$ 2,413
Due after one year through five years, Amortized Cost	10,584
Due after five years through ten years, Amortized Cost	18,130
Due after ten years, Amortized Cost	1,090,653
Totals, Amortized Cost	1,121,780
Due in one year, Estimated Fair Value	2,418
Due after one year through five years, Estimated Fair Value	10,798
Due after five years through ten years, Estimated Fair Value	18,624
Due after ten years, Estimated Fair Value	1,081,676
Totals, Estimated Fair Value	1,113,516
Due after one year through five years, Amortized Cost, Held to Maturity	1,246
Due after five years through ten years, Amortized Cost, Held to Maturity	23,944
Due after ten years, Amortized Cost, Held to Maturity	405,826
Totals, Amortized Cost, Held to Maturity	431,016	$ 444,936
Due after one year through five years, Estimated Fair Value, Held to Maturity	1,260
Due after five years through ten years, Estimated Fair Value, Held to Maturity	23,899
Due after ten years, Estimated Fair Value, Held to Maturity	405,614
Estimated Fair Value, Held to Maturity	$ 430,773	$ 437,370

Investment Securities - Gross U

Investment Securities - Gross Unrealized Losses on Investment Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Less than 12 months, Fair Value	$ 355,203	$ 336,433
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss	(4,918)	(6,148)
Debt Securities Available for Sale, 12 months or more, Fair Value	496,990	415,349
Debt Securities Available for Sale, 12 months or more, Unrealized Loss	(6,675)	(16,061)
Debt Securities Available for Sale, Fair Value	852,193	751,782
Debt Securities Available for Sale, Unrealized Loss	(11,593)	(22,209)
Debt Securities Held to Maturity, Less than 12 months, Fair Value		229,596
Debt Securities Held to Maturity, Less than 12 months, Unrealized Loss		(2,733)
Debt Securities Held to Maturity, 12 months or more, Fair Value	230,442	162,690
Debt Securities Held to Maturity, 12 months or more, Unrealized Loss	(2,606)	(5,242)
Debt Securities Held to Maturity, Fair Value	230,442	392,286
Debt Securities Held to Maturity, Unrealized Loss	(2,606)	(7,975)
Obligations of U.S. Government Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Less than 12 months, Fair Value	481	171,309
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss	(2)	(3,588)
Debt Securities Available for Sale, 12 months or more, Fair Value	496,424	394,630
Debt Securities Available for Sale, 12 months or more, Unrealized Loss	(6,674)	(14,490)
Debt Securities Available for Sale, Fair Value	496,905	565,939
Debt Securities Available for Sale, Unrealized Loss	(6,676)	(18,078)
Debt Securities Held to Maturity, Less than 12 months, Fair Value		223,810
Debt Securities Held to Maturity, Less than 12 months, Unrealized Loss		(2,619)
Debt Securities Held to Maturity, 12 months or more, Fair Value	224,551	158,648
Debt Securities Held to Maturity, 12 months or more, Unrealized Loss	(2,581)	(5,126)
Debt Securities Held to Maturity, Fair Value	224,551	382,458
Debt Securities Held to Maturity, Unrealized Loss	(2,581)	(7,745)
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Less than 12 months, Fair Value	24,644	63,738
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss	(598)	(1,541)
Debt Securities Available for Sale, 12 months or more, Fair Value	566	20,719
Debt Securities Available for Sale, 12 months or more, Unrealized Loss	(1)	(1,571)
Debt Securities Available for Sale, Fair Value	25,210	84,457
Debt Securities Available for Sale, Unrealized Loss	(599)	(3,112)
Debt Securities Held to Maturity, Less than 12 months, Fair Value		5,786
Debt Securities Held to Maturity, Less than 12 months, Unrealized Loss		(114)
Debt Securities Held to Maturity, 12 months or more, Fair Value	5,891	4,042
Debt Securities Held to Maturity, 12 months or more, Unrealized Loss	(25)	(116)
Debt Securities Held to Maturity, Fair Value	5,891	9,828
Debt Securities Held to Maturity, Unrealized Loss	(25)	(230)
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities Available for Sale, Less than 12 months, Fair Value	330,078	101,386
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss	(4,318)	(1,019)
Debt Securities Available for Sale, Fair Value	330,078	101,386
Debt Securities Available for Sale, Unrealized Loss	$ (4,318)	$ (1,019)

Loans - Summary of Loan Balance

Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Total principal balance of loans owed, net of charge-offs	$ 4,085,452	$ 4,075,244
Unamortized net deferred loan fees	(9,413)	(9,868)
Discounts to principal balance of loans owed, net of charge-offs	(41,708)	(43,362)
Total loans, net of unamortized deferred loan fees and discounts	4,034,331	4,022,014	$ 3,069,733
Allowance for loan losses	(32,064)	(32,582)	(29,973)	$ (30,323)
Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,129,339	3,143,100	2,359,379
Allowance for loan losses	(14,830)	(15,620)	(13,665)	(13,758)
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	418,352	418,982	348,789
Allowance for loan losses	(8,341)	(8,375)	(7,718)	(8,227)
Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	269,163	276,548	216,015
Allowance for loan losses	(6,078)	(6,090)	(6,392)	(6,512)
Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	217,477	183,384	145,550
Allowance for loan losses	(2,815)	(2,497)	(2,198)	(1,826)
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	522,412	515,262	386,111
Allowance for loan losses	(2,500)	(2,676)	(2,170)	(2,317)
Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	35,037	36,684	41,932
Allowance for loan losses	(1,286)	(1,540)	(1,736)	(1,841)
Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	65,062	55,721	23,606
Allowance for loan losses	(1,040)	(793)	(570)	(586)
Commercial [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,606,927	2,627,838	1,973,268
Allowance for loan losses	(12,330)	(12,944)	(11,495)	(11,441)
Commercial [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	71,693	62,088	73,952
Allowance for loan losses	(407)	(663)	(847)	(642)
Home Equity Lines of Credit [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	318,253	326,577	283,251
Allowance for loan losses	(6,015)	(6,042)	(5,412)	(5,800)
Residential [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	145,784	121,296	71,598
Allowance for loan losses	(2,408)	(1,834)	$ (1,351)	$ (1,184)
Originated [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total principal balance of loans owed, net of charge-offs	3,059,398	2,991,324
Unamortized net deferred loan fees	(9,413)	(9,868)
Total loans, net of unamortized deferred loan fees and discounts	3,049,985	2,981,456
Allowance for loan losses	(31,088)	(31,793)
Originated [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,287,067	2,254,777
Originated [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	355,340	351,133
Originated [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	227,314	228,635
Originated [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	180,264	146,911
Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	357,559	343,796
Originated [Member] | Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	31,245	32,660
Originated [Member] | Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	45,020	34,020
Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,929,508	1,910,981
Originated [Member] | Commercial [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	64,576	56,208
Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	279,075	284,453
Originated [Member] | Residential [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	115,688	90,703
PNCI [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total principal balance of loans owed, net of charge-offs	1,007,678	1,062,655
Discounts to principal balance of loans owed, net of charge-offs	(35,058)	(36,320)
Total loans, net of unamortized deferred loan fees and discounts	972,620	1,026,335
Allowance for loan losses	(969)	(667)
PNCI [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	834,665	878,193
PNCI [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	61,447	66,201
PNCI [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	39,295	45,468
PNCI [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	37,213	36,473
PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	163,268	169,792
PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,356	3,585
PNCI [Member] | Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	20,001	21,659
PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	671,397	708,401
PNCI [Member] | Commercial [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	7,117	5,880
PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	38,090	40,957
PNCI [Member] | Residential [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	30,096	30,593
PCI [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total principal balance of loans owed, net of charge-offs	18,376	21,265
Discounts to principal balance of loans owed, net of charge-offs	(6,650)	(7,042)
Total loans, net of unamortized deferred loan fees and discounts	11,726	14,223
Allowance for loan losses	(7)	(122)
PCI [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	7,607	10,130
PCI [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,565	1,648
PCI [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,554	2,445
PCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,585	1,674
PCI [Member] | Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	436	439
PCI [Member] | Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	41	42
PCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	6,022	8,456
PCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	$ 1,088	$ 1,167

Loans - Change in Accretable Yi

Loans - Change in Accretable Yield for PCI (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Change in accretable yield:
Balance at beginning of period	$ 6,059	$ 6,137
Accretion to interest income	(301)	(255)
Reclassification (to) from nonaccretable difference	(11)	140
Balance at end of period	$ 5,747	$ 6,022

Allowance for Loan Losses - Sum

Allowance for Loan Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	$ 32,582	$ 30,323	$ 30,323
Charge-offs	(726)	(480)	(2,364)
Recoveries	1,808	366	2,040
Provision (benefit)	(1,600)	(236)	2,583
Ending Balance	32,064	29,973	32,582
Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	15,620	13,758	13,758
Charge-offs		(1)	(92)
Recoveries	1,383	15	68
Provision (benefit)	(2,173)	(107)	1,886
Ending Balance	14,830	13,665	15,620
Mortgage Loans on Real Estate [Member] | Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	12,944	11,441	11,441
Charge-offs			(15)
Recoveries	1,381	15	68
Provision (benefit)	(1,995)	39	1,450
Ending Balance	12,330	11,495	12,944
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	8,375	8,227	8,227
Charge-offs	(207)	(274)	(1,084)
Recoveries	257	301	1,431
Provision (benefit)	(84)	(536)	(199)
Ending Balance	8,341	7,718	8,375
Consumer [Member] | Home Equity Lines of Credit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	6,042	5,800	5,800
Charge-offs		(80)	(277)
Recoveries	95	209	846
Provision (benefit)	(122)	(517)	(327)
Ending Balance	6,015	5,412	6,042
Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	6,090	6,512	6,512
Charge-offs	(519)	(205)	(1,188)
Recoveries	168	50	541
Provision (benefit)	339	35	225
Ending Balance	6,078	6,392	6,090
Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	2,497	1,826	1,826
Provision (benefit)	318	372	671
Ending Balance	2,815	2,198	2,497
Construction [Member] | Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	663	642	642
Provision (benefit)	(256)	205	21
Ending Balance	407	847	663
Construction [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	1,834	1,184	1,184
Provision (benefit)	574	167	650
Ending Balance	2,408	1,351	1,834
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	2,676	2,317	2,317
Charge-offs		(1)	(77)
Recoveries	2
Provision (benefit)	(178)	(146)	436
Ending Balance	2,500	2,170	2,676
Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	1,540	1,841	1,841
Charge-offs			(24)
Recoveries	87	14	297
Provision (benefit)	(341)	(119)	(574)
Ending Balance	1,286	1,736	1,540
Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning Balance	793	586	586
Charge-offs	(207)	(194)	(783)
Recoveries	75	78	288
Provision (benefit)	379	100	702
Ending Balance	$ 1,040	$ 570	$ 793

Allowance for Loan Losses - S_2

Allowance for Loan Losses - Summary of Activity in Allowance for Loan Losses, Net of Unearned Fees for Periods Indicated (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans pooled for evaluation	$ 30,307	$ 30,266	$ 26,714
Allowance for Loan Losses, Individually evaluated for impairment	1,750	2,194	3,091
Total allowance for loan losses	32,064	32,582	29,973	$ 30,323
Loans, Net of Unearned fees , Loans pooled for evaluation	4,001,560	3,979,744	3,029,454
Loans, Net of Unearned fees , Individually evaluated for impairment	21,045	28,047	25,803
Total loans, net of unamortized deferred loan fees and discounts	4,034,331	4,022,014	3,069,733
Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans pooled for evaluation	14,738	15,357	13,191
Allowance for Loan Losses, Individually evaluated for impairment	91	147	344
Total allowance for loan losses	14,830	15,620	13,665	13,758
Loans, Net of Unearned fees , Loans pooled for evaluation	3,110,032	3,116,086	2,332,952
Loans, Net of Unearned fees , Individually evaluated for impairment	11,700	16,884	16,645
Total loans, net of unamortized deferred loan fees and discounts	3,129,339	3,143,100	2,359,379
Mortgage Loans on Real Estate [Member] | Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans pooled for evaluation	12,293	12,737	11,281
Allowance for Loan Losses, Individually evaluated for impairment	36	91	154
Total allowance for loan losses	12,330	12,944	11,495	11,441
Loans, Net of Unearned fees , Loans pooled for evaluation	2,592,994	2,606,819	1,954,120
Loans, Net of Unearned fees , Individually evaluated for impairment	7,911	12,563	11,110
Total loans, net of unamortized deferred loan fees and discounts	2,606,927	2,627,838	1,973,268
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans pooled for evaluation	8,118	8,103	7,076
Allowance for Loan Losses, Individually evaluated for impairment	217	266	634
Total allowance for loan losses	8,341	8,375	7,718	8,227
Loans, Net of Unearned fees , Loans pooled for evaluation	412,118	411,389	342,199
Loans, Net of Unearned fees , Individually evaluated for impairment	4,669	5,945	4,401
Total loans, net of unamortized deferred loan fees and discounts	418,352	418,982	348,789
Consumer [Member] | Home Equity Lines of Credit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans pooled for evaluation	5,879	5,838	4,956
Allowance for Loan Losses, Individually evaluated for impairment	130	198	448
Total allowance for loan losses	6,015	6,042	5,412	5,800
Loans, Net of Unearned fees , Loans pooled for evaluation	314,609	322,764	279,140
Loans, Net of Unearned fees , Individually evaluated for impairment	2,556	2,646	2,450
Total loans, net of unamortized deferred loan fees and discounts	318,253	326,577	283,251
Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans pooled for evaluation	4,636	4,309	4,249
Allowance for Loan Losses, Individually evaluated for impairment	1,442	1,781	2,113
Total allowance for loan losses	6,078	6,090	6,392	6,512
Loans, Net of Unearned fees , Loans pooled for evaluation	261,933	268,885	208,889
Loans, Net of Unearned fees , Individually evaluated for impairment	4,676	5,218	4,621
Total loans, net of unamortized deferred loan fees and discounts	269,163	276,548	216,015
Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans pooled for evaluation	2,815	2,497	2,198
Total allowance for loan losses	2,815	2,497	2,198	1,826
Loans, Net of Unearned fees , Loans pooled for evaluation	217,477	183,384	145,414
Loans, Net of Unearned fees , Individually evaluated for impairment			136
Total loans, net of unamortized deferred loan fees and discounts	217,477	183,384	145,550
Construction [Member] | Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans pooled for evaluation	407	663	847
Total allowance for loan losses	407	663	847	642
Loans, Net of Unearned fees , Loans pooled for evaluation	71,693	62,088	73,952
Total loans, net of unamortized deferred loan fees and discounts	71,693	62,088	73,952
Construction [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans pooled for evaluation	2,408	1,834	1,351
Total allowance for loan losses	2,408	1,834	1,351	1,184
Loans, Net of Unearned fees , Loans pooled for evaluation	145,784	121,296	71,462
Loans, Net of Unearned fees , Individually evaluated for impairment			136
Total loans, net of unamortized deferred loan fees and discounts	145,784	121,296	71,598
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans pooled for evaluation	2,445	2,620	1,910
Allowance for Loan Losses, Individually evaluated for impairment	55	56	190
Total allowance for loan losses	2,500	2,676	2,170	2,317
Loans, Net of Unearned fees , Loans pooled for evaluation	517,038	509,267	378,832
Loans, Net of Unearned fees , Individually evaluated for impairment	3,789	4,321	5,535
Total loans, net of unamortized deferred loan fees and discounts	522,412	515,262	386,111
Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans pooled for evaluation	1,216	1,486	1,606
Allowance for Loan Losses, Individually evaluated for impairment	70	54	130
Total allowance for loan losses	1,286	1,540	1,736	1,841
Loans, Net of Unearned fees , Loans pooled for evaluation	32,618	33,142	39,774
Loans, Net of Unearned fees , Individually evaluated for impairment	1,983	3,103	1,673
Total loans, net of unamortized deferred loan fees and discounts	35,037	36,684	41,932
Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans pooled for evaluation	1,023	779	514
Allowance for Loan Losses, Individually evaluated for impairment	17	14	56
Total allowance for loan losses	1,040	793	570	$ 586
Loans, Net of Unearned fees , Loans pooled for evaluation	64,891	55,483	23,285
Loans, Net of Unearned fees , Individually evaluated for impairment	130	196	278
Total loans, net of unamortized deferred loan fees and discounts	65,062	55,721	23,606
Financial Asset Acquired with Credit Deterioration [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans acquired with deteriorated credit quality	7	122	168
Total loans, net of unamortized deferred loan fees and discounts	11,726	14,223	14,476
Financial Asset Acquired with Credit Deterioration [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans acquired with deteriorated credit quality	1	116	130
Total loans, net of unamortized deferred loan fees and discounts	7,607	10,130	9,782
Financial Asset Acquired with Credit Deterioration [Member] | Mortgage Loans on Real Estate [Member] | Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans acquired with deteriorated credit quality	1	116	60
Total loans, net of unamortized deferred loan fees and discounts	6,022	8,456	8,038
Financial Asset Acquired with Credit Deterioration [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans acquired with deteriorated credit quality	6	6	8
Total loans, net of unamortized deferred loan fees and discounts	1,565	1,648	2,189
Financial Asset Acquired with Credit Deterioration [Member] | Consumer [Member] | Home Equity Lines of Credit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans acquired with deteriorated credit quality	6	6	8
Total loans, net of unamortized deferred loan fees and discounts	1,088	1,167	1,661
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans acquired with deteriorated credit quality			30
Total loans, net of unamortized deferred loan fees and discounts	2,554	2,445	2,505
Financial Asset Acquired with Credit Deterioration [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Loans acquired with deteriorated credit quality			70
Total loans, net of unamortized deferred loan fees and discounts	1,585	1,674	1,744
Financial Asset Acquired with Credit Deterioration [Member] | Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	436	439	485
Financial Asset Acquired with Credit Deterioration [Member] | Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	$ 41	$ 42	$ 43

Allowance for Loan Losses - Sch

Allowance for Loan Losses - Schedule Credit Quality Indicators (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	$ 4,034,331	$ 4,022,014	$ 3,069,733
Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,129,339	3,143,100	2,359,379
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	418,352	418,982	348,789
Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	269,163	276,548	216,015
Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	217,477	183,384	145,550
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	522,412	515,262	386,111
Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	35,037	36,684	41,932
Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	65,062	55,721	23,606
Originated [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,049,985	2,981,456
Originated [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,287,067	2,254,777
Originated [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	355,340	351,133
Originated [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	227,314	228,635
Originated [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	180,264	146,911
Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	357,559	343,796
Originated [Member] | Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	31,245	32,660
Originated [Member] | Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	45,020	34,020
PNCI [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	972,620	1,026,335
PNCI [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	834,665	878,193
PNCI [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	61,447	66,201
PNCI [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	39,295	45,468
PNCI [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	37,213	36,473
PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	163,268	169,792
PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,356	3,585
PNCI [Member] | Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	20,001	21,659
Commercial [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,606,927	2,627,838	1,973,268
Commercial [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	71,693	62,088	73,952
Commercial [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,929,508	1,910,981
Commercial [Member] | Originated [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	64,576	56,208
Commercial [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	671,397	708,401
Commercial [Member] | PNCI [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	7,117	5,880
Home Equity Lines of Credit [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	318,253	326,577	283,251
Home Equity Lines of Credit [Member] | Originated [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	279,075	284,453
Home Equity Lines of Credit [Member] | PNCI [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	38,090	40,957
Residential [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	145,784	121,296	$ 71,598
Residential [Member] | Originated [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	115,688	90,703
Residential [Member] | PNCI [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	30,096	30,593
Pass [Member] | Originated [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,976,725	2,904,603
Pass [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,237,214	2,198,816
Pass [Member] | Originated [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	345,083	342,386
Pass [Member] | Originated [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	214,758	217,126
Pass [Member] | Originated [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	179,670	146,275
Pass [Member] | Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	350,256	337,189
Pass [Member] | Originated [Member] | Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	27,328	29,289
Pass [Member] | Originated [Member] | Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	44,611	33,606
Pass [Member] | PNCI [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	961,563	1,014,950
Pass [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	826,981	869,776
Pass [Member] | PNCI [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	58,852	63,674
Pass [Member] | PNCI [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	38,762	45,027
Pass [Member] | PNCI [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	36,968	36,473
Pass [Member] | PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	161,351	167,908
Pass [Member] | PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,174	3,413
Pass [Member] | PNCI [Member] | Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	19,790	21,481
Pass [Member] | Commercial [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,886,958	1,861,627
Pass [Member] | Commercial [Member] | Originated [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	64,238	55,863
Pass [Member] | Commercial [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	665,630	701,868
Pass [Member] | Commercial [Member] | PNCI [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	6,872	5,880
Pass [Member] | Home Equity Lines of Credit [Member] | Originated [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	273,144	279,491
Pass [Member] | Home Equity Lines of Credit [Member] | PNCI [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	35,888	38,780
Pass [Member] | Residential [Member] | Originated [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	115,432	90,412
Pass [Member] | Residential [Member] | PNCI [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	30,096	30,593
Special Mention [Member] | Originated [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	47,844	45,415
Special Mention [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	34,901	35,207
Special Mention [Member] | Originated [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	4,709	3,704
Special Mention [Member] | Originated [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	7,896	6,127
Special Mention [Member] | Originated [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	338	377
Special Mention [Member] | Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,807	1,724
Special Mention [Member] | Originated [Member] | Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,533	1,054
Special Mention [Member] | Originated [Member] | Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	309	341
Special Mention [Member] | PNCI [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	5,268	5,863
Special Mention [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,836	4,171
Special Mention [Member] | PNCI [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,231	1,371
Special Mention [Member] | PNCI [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	201	321
Special Mention [Member] | PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,109	1,086
Special Mention [Member] | PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	98	74
Special Mention [Member] | PNCI [Member] | Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	208	173
Special Mention [Member] | Commercial [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	33,094	33,483
Special Mention [Member] | Commercial [Member] | Originated [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	338	345
Special Mention [Member] | Commercial [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,727	3,085
Special Mention [Member] | Home Equity Lines of Credit [Member] | Originated [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,867	2,309
Special Mention [Member] | Home Equity Lines of Credit [Member] | PNCI [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	925	1,124
Special Mention [Member] | Residential [Member] | Originated [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts		32
Substandard [Member] | Originated [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	25,416	31,438
Substandard [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	14,952	20,754
Substandard [Member] | Originated [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	5,548	5,043
Substandard [Member] | Originated [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	4,660	5,382
Substandard [Member] | Originated [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	256	259
Substandard [Member] | Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	5,496	4,883
Substandard [Member] | Originated [Member] | Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	2,384	2,317
Substandard [Member] | Originated [Member] | Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	100	73
Substandard [Member] | PNCI [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	5,789	5,522
Substandard [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,848	4,246
Substandard [Member] | PNCI [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,364	1,156
Substandard [Member] | PNCI [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	332	120
Substandard [Member] | PNCI [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	245
Substandard [Member] | PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	808	798
Substandard [Member] | PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	84	98
Substandard [Member] | PNCI [Member] | Other Consumer [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3	5
Substandard [Member] | Commercial [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	9,456	15,871
Substandard [Member] | Commercial [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,040	3,448
Substandard [Member] | Commercial [Member] | PNCI [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	245
Substandard [Member] | Home Equity Lines of Credit [Member] | Originated [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	3,064	2,653
Substandard [Member] | Home Equity Lines of Credit [Member] | PNCI [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	1,277	1,053
Substandard [Member] | Residential [Member] | Originated [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	256	$ 259
Substandard [Member] | Residential [Member] | PNCI [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of unamortized deferred loan fees and discounts	$ 0

Allowance for Loan Losses - Ana

Allowance for Loan Losses - Analysis of Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 4,034,331	$ 4,022,014	$ 3,069,733
Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,129,339	3,143,100	2,359,379
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	418,352	418,982	348,789
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	269,163	276,548	216,015
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	217,477	183,384	145,550
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	522,412	515,262	386,111
Home Equity Loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	35,037	36,684	41,932
Other Consumer [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	65,062	55,721	23,606
Commercial [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,606,927	2,627,838	1,973,268
Commercial [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	71,693	62,088	73,952
Home Equity Lines of Credit [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	318,253	326,577	283,251
Residential [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	145,784	121,296	$ 71,598
Originated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	10,032	10,460
Current	3,039,953	2,970,996
Total	3,049,985	2,981,456
> 90 Days and Still Accruing	40
Originated [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	4,295	4,212
Current	2,282,772	2,250,565
Total	2,287,067	2,254,777
Originated [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3,006	3,160
Current	352,334	347,973
Total	355,340	351,133
> 90 Days and Still Accruing	26
Originated [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,946	2,879
Current	225,368	225,756
Total	227,314	228,635
> 90 Days and Still Accruing	14
Originated [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	785	209
Current	179,479	146,702
Total	180,264	146,911
Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,627	2,285
Current	354,932	341,511
Total	357,559	343,796
Originated [Member] | Home Equity Loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	699	1,281
Current	30,546	31,379
Total	31,245	32,660
> 90 Days and Still Accruing	17
Originated [Member] | Other Consumer [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	160	315
Current	44,860	33,705
Total	45,020	34,020
> 90 Days and Still Accruing	9
Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,668	1,927
Current	1,927,840	1,909,054
Total	1,929,508	1,910,981
Originated [Member] | Commercial [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	64,576	56,208
Total	64,576	56,208
Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,147	1,564
Current	276,928	282,889
Total	279,075	284,453
Originated [Member] | Residential [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	785	209
Current	114,903	90,494
Total	115,688	90,703
PNCI [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	6,492	6,908
Current	966,128	1,019,427
Total	972,620	1,026,335
PNCI [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	5,574	5,162
Current	829,091	873,031
Total	834,665	878,193
PNCI [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	584	810
Current	60,863	65,391
Total	61,447	66,201
PNCI [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	334	936
Current	38,961	44,532
Total	39,295	45,468
PNCI [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	37,213	36,473
Total	37,213	36,473
PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,727	1,298
Current	161,541	168,494
Total	163,268	169,792
PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	14	74
Current	3,342	3,511
Total	3,356	3,585
PNCI [Member] | Other Consumer [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	151	160
Current	19,850	21,499
Total	20,001	21,659
PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3,847	3,864
Current	667,550	704,537
Total	671,397	708,401
PNCI [Member] | Commercial [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	7,117	5,880
Total	7,117	5,880
PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	419	576
Current	37,671	40,381
Total	38,090	40,957
PNCI [Member] | Residential [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	30,096	30,593
Total	30,096	30,593
30-59 Days [Member] | Originated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	7,342	5,617
30-59 Days [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,998	2,106
30-59 Days [Member] | Originated [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,437	2,249
30-59 Days [Member] | Originated [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,122	1,053
30-59 Days [Member] | Originated [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	785	209
30-59 Days [Member] | Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,231	1,675
30-59 Days [Member] | Originated [Member] | Home Equity Loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	512	1,043
30-59 Days [Member] | Originated [Member] | Other Consumer [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	151	298
30-59 Days [Member] | Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	767	431
30-59 Days [Member] | Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,774	908
30-59 Days [Member] | Originated [Member] | Residential [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	785	209
30-59 Days [Member] | PNCI [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	4,940	3,871
30-59 Days [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	4,355	2,655
30-59 Days [Member] | PNCI [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	583	538
30-59 Days [Member] | PNCI [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2	678
30-59 Days [Member] | PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,457	1,009
30-59 Days [Member] | PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	14	74
30-59 Days [Member] | PNCI [Member] | Other Consumer [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	151	160
30-59 Days [Member] | PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,898	1,646
30-59 Days [Member] | PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	418	304
60-89 Days [Member] | Originated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	488	1,999
60-89 Days [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		1,332
60-89 Days [Member] | Originated [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	35	88
60-89 Days [Member] | Originated [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	453	579
60-89 Days [Member] | Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		132
60-89 Days [Member] | Originated [Member] | Home Equity Loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	24	24
60-89 Days [Member] | Originated [Member] | Other Consumer [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		17
60-89 Days [Member] | Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		1,200
60-89 Days [Member] | Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	11	47
60-89 Days [Member] | PNCI [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	369	1,449
60-89 Days [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	270	1,269
60-89 Days [Member] | PNCI [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		35
60-89 Days [Member] | PNCI [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	99	145
60-89 Days [Member] | PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	270	133
60-89 Days [Member] | PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		1,136
60-89 Days [Member] | PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		35
> 90 Days [Member] | Originated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,202	2,844
> 90 Days [Member] | Originated [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,297	774
> 90 Days [Member] | Originated [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	534	823
> 90 Days [Member] | Originated [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	371	1,247
> 90 Days [Member] | Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	396	478
> 90 Days [Member] | Originated [Member] | Home Equity Loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	163	214
> 90 Days [Member] | Originated [Member] | Other Consumer [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	9
> 90 Days [Member] | Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	901	296
> 90 Days [Member] | Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	362	609
> 90 Days [Member] | PNCI [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,183	1,588
> 90 Days [Member] | PNCI [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	949	1,238
> 90 Days [Member] | PNCI [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1	237
> 90 Days [Member] | PNCI [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	233	113
> 90 Days [Member] | PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		156
> 90 Days [Member] | PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	949	1,082
> 90 Days [Member] | PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 1	$ 237

Allowance for Loan Losses - Add

Allowance for Loan Losses - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Originated [Member]
Loans and Leases Receivable Disclosure [Line Items]
Interest income on non accrual loans	$ 279,000	$ 285,000
Interest income on non accrual loans ,recognized	33,000	22,000
Impaired TDR Loans	9,547,000	9,871,000	$ 10,253,000
Obligations to lend additional funds on TDR	0	0	0
PNCI [Member]
Loans and Leases Receivable Disclosure [Line Items]
Interest income on non accrual loans	121,000	27,000
Interest income on non accrual loans ,recognized	60,000	0
Impaired TDR Loans	823,000	1,471,000	615,000
Obligations to lend additional funds on TDR	$ 0	$ 0	$ 0

Allowance for Loan Losses - S_3

Allowance for Loan Losses - Schedule of Non Accrual Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 16,322	$ 22,274
Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	9,312	14,309
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	3,534	4,090
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	3,476	3,875
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	3,374	3,578
Home Equity Loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	1,635	1,769
Other Consumer [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	32	7
Commercial [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	5,938	10,731
Home Equity Lines of Credit [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	1,867	2,314
Originated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	13,696	19,416
Originated [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	7,559	12,507
Originated [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	2,993	3,154
Originated [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	3,144	3,755
Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	3,066	3,244
Originated [Member] | Home Equity Loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	1,599	1,722
Originated [Member] | Other Consumer [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	28	3
Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	4,493	9,263
Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	1,366	1,429
PNCI [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	2,626	2,858
PNCI [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	1,753	1,802
PNCI [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	541	936
PNCI [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	332	120
PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	308	334
PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	36	47
PNCI [Member] | Other Consumer [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	4	4
PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	1,445	1,468
PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 501	$ 885

Allowance for Loan Losses - Imp

Allowance for Loan Losses - Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Originated [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$ 19,693	$ 23,903	$ 27,385
Recorded investment with no related allowance	15,032	15,624	20,904
Recorded investment with related allowance	2,841	7,254	4,539
Total recorded investment	17,873	22,878	25,443
Related Allowance	1,362	2,617	1,948
Average recorded investment	22,199	24,072	24,713
Interest income recognized	32	112	386
Originated [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	10,919	15,785	17,675
Recorded investment with no related allowance	9,355	12,526	14,339
Recorded investment with related allowance	592	2,787	2,073
Total recorded investment	9,947	15,313	16,412
Related Allowance	92	344	98
Average recorded investment	13,482	16,581	16,632
Interest income recognized	28	72	227
Originated [Member] | Consumer [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	4,236	3,226	4,277
Recorded investment with no related allowance	3,376	2,081	3,641
Recorded investment with related allowance	206	727	179
Total recorded investment	3,582	2,808	3,820
Related Allowance	47	160	76
Average recorded investment	3,939	2,808	3,422
Interest income recognized	4	12	68
Originated [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	4,538	4,756	5,433
Recorded investment with no related allowance	2,301	881	2,924
Recorded investment with related allowance	2,043	3,740	2,287
Total recorded investment	4,344	4,621	5,211
Related Allowance	1,223	2,113	1,774
Average recorded investment	4,778	4,545	4,654
Interest income recognized		26	91
Originated [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance		136
Recorded investment with no related allowance		136
Total recorded investment		136
Average recorded investment		138	5
Interest income recognized		2
Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	4,148	4,378	4,594
Recorded investment with no related allowance	3,481	2,678	3,663
Recorded investment with related allowance		1,525	308
Total recorded investment	3,481	4,203	3,971
Related Allowance	55	190	56
Average recorded investment	4,029	4,071	3,517
Interest income recognized	6	28	90
Originated [Member] | Home Equity Loans [Member] | Consumer [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	2,333	1,744	2,374
Recorded investment with no related allowance	1,639	1,193	1,892
Recorded investment with related allowance	120	196	65
Total recorded investment	1,759	1,389	1,957
Related Allowance	20	10	2
Average recorded investment	1,963	1,347	1,520
Interest income recognized		2	23
Originated [Member] | Other Consumer [Member] | Consumer [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	46	4	3
Recorded investment with related allowance	28	4	3
Total recorded investment	28	4	3
Related Allowance	9	4	3
Average recorded investment	33	6	17
Interest income recognized			2
Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	6,771	11,407	13,081
Recorded investment with no related allowance	5,874	9,848	10,676
Recorded investment with related allowance	592	1,262	1,765
Total recorded investment	6,466	11,110	12,441
Related Allowance	37	154	42
Average recorded investment	9,453	12,510	13,115
Interest income recognized	22	44	137
Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	1,857	1,478	1,900
Recorded investment with no related allowance	1,737	888	1,749
Recorded investment with related allowance	58	527	111
Total recorded investment	1,795	1,415	1,860
Related Allowance	18	146	71
Average recorded investment	1,943	1,455	1,885
Interest income recognized	4	10	43
Originated [Member] | Residential [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance		136
Recorded investment with no related allowance		136
Total recorded investment		136
Average recorded investment		138	5
Interest income recognized		2
PNCI [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	4,943	3,027	4,990
Recorded investment with no related allowance	2,433	1,901	2,570
Recorded investment with related allowance	739	1,024	656
Total recorded investment	3,172	2,925	3,226
Related Allowance	388	474	246
Average recorded investment	3,224	2,946	3,691
Interest income recognized	60	12	207
PNCI [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	3,433	1,390	3,485
Recorded investment with no related allowance	1,753	1,332	1,802
Total recorded investment	1,753	1,332	1,802
Average recorded investment	1,777	1,345	2,242
Interest income recognized	58	2	188
PNCI [Member] | Consumer [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	1,175	1,637	1,385
Recorded investment with no related allowance	567	569	655
Recorded investment with related allowance	520	1,024	649
Total recorded investment	1,087	1,593	1,304
Related Allowance	169	474	239
Average recorded investment	1,221	1,601	1,389
Interest income recognized		10	18
PNCI [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	335		120
Recorded investment with no related allowance	113		113
Recorded investment with related allowance	219		7
Total recorded investment	332		120
Related Allowance	219		7
Average recorded investment	226		60
Interest income recognized	2		1
PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	344	1,390	375
Recorded investment with no related allowance	308	1,332	334
Total recorded investment	308	1,332	334
Average recorded investment	321	1,345	529
Interest income recognized		2	5
PNCI [Member] | Home Equity Loans [Member] | Consumer [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	242	298	252
Recorded investment with no related allowance	102	40	47
Recorded investment with related allowance	122	244	197
Total recorded investment	224	284	244
Related Allowance	50	120	101
Average recorded investment	232	225	155
Interest income recognized		3
PNCI [Member] | Other Consumer [Member] | Consumer [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	102	274	106
Recorded investment with no related allowance	64	28	21
Recorded investment with related allowance	38	246	85
Total recorded investment	102	274	106
Related Allowance	7	52	11
Average recorded investment	106	262	114
Interest income recognized		2
PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	3,089		3,110
Recorded investment with no related allowance	1,445		1,468
Total recorded investment	1,445		1,468
Average recorded investment	1,456		1,713
Interest income recognized	58		183
PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	831	1,065	1,027
Recorded investment with no related allowance	401	501	587
Recorded investment with related allowance	360	534	367
Total recorded investment	761	1,035	954
Related Allowance	112	302	127
Average recorded investment	$ 883	1,114	1,120
Interest income recognized		$ 5	$ 18

Allowance for Loan Losses - Tro

Allowance for Loan Losses - Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)BranchesSecurityLoan	Mar. 31, 2018USD ($)BranchesSecurityLoan
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	4	3
Pre-mod outstanding principal balance	$ 299	$ 638
Post-mod outstanding principal balance	297	643
Financial impact due to TDR taken as additional provision	$ 1	$ 11
Number that defaulted during the period | Branches	1	1
Recorded investment of TDRs that defaulted during the period	$ 7	$ 169
Mortgage Loans on Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	1	1
Pre-mod outstanding principal balance	$ 163	$ 384
Post-mod outstanding principal balance	$ 162	384
Financial impact due to TDR taken as additional provision		$ 11
Number that defaulted during the period | Branches		1
Recorded investment of TDRs that defaulted during the period		$ 169
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	1	2
Pre-mod outstanding principal balance	$ 121	$ 254
Post-mod outstanding principal balance	120	$ 259
Financial impact due to TDR taken as additional provision	$ 1
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	2
Pre-mod outstanding principal balance	$ 15
Post-mod outstanding principal balance	$ 15
Number that defaulted during the period | Branches	1
Recorded investment of TDRs that defaulted during the period	$ 7
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	1
Pre-mod outstanding principal balance	$ 163
Post-mod outstanding principal balance	$ 162
Home Equity Loans [Member] | Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan	1	1
Pre-mod outstanding principal balance	$ 121	$ 121
Post-mod outstanding principal balance	120	$ 121
Financial impact due to TDR taken as additional provision	$ 1
Commercial [Member] | Mortgage Loans on Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan		1
Pre-mod outstanding principal balance		$ 384
Post-mod outstanding principal balance		384
Financial impact due to TDR taken as additional provision		$ 11
Number that defaulted during the period | Branches		1
Recorded investment of TDRs that defaulted during the period		$ 169
Home Equity Lines of Credit [Member] | Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number | SecurityLoan		1
Pre-mod outstanding principal balance		$ 133
Post-mod outstanding principal balance		$ 138

Leases - Lease Costs and Other

Leases - Lease Costs and Other Lease Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Operating lease cost	$ 1,311
Short-term lease cost	71
Variable lease cost	(5)
Sublease income	(34)
Total lease cost	$ 1,343

Leases - Additional Informatio

Leases - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018USD ($)
Operating Leases, Rent Expense	$ 921,000
Rental Income, Nonoperating	$ 10,000

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information Related To Operating Leases (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 1,218
ROUA obtained in exchange for operating lease liabilities	$ 32,006

Leases - Weighted Average Lease

Leases - Weighted Average Lease Term And Discount Rate Related To Operating Lease (Detail)	Mar. 31, 2019
Operating Lease, Weighted Average Remaining Lease Term	9 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent	3.17%

Leases - Future Minimum Rental

Leases - Future Minimum Rental Payments For Operating Leases (Detail) $ in Thousands	Mar. 31, 2019USD ($)
2019	$ 3,519
2020	4,380
2021	4,226
2022	3,887
2023	3,208
Thereafter	16,455
Operating Leases, Future Minimum Payments Due	35,675
Discount for present value of expected cash flows	(5,471)
Lease liability at March 31, 2019	$ 30,204

Deposits - Summary of Balances

Deposits - Summary of Balances of Deposits (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Deposits [Abstract]
Noninterest-bearing demand	$ 1,761,559	$ 1,760,580
Interest-bearing demand	1,297,672	1,252,366
Savings	1,925,168	1,921,324
Time certificates, $250,000 and above	135,716	132,429
Other time certificates	310,147	299,767
Total deposits	$ 5,430,262	$ 5,366,466

Deposits - Additional Informati

Deposits - Additional Information (Detail) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Schedule Of Deposits [Line Items]
Overdrawn deposit balances classified as consumer loans	$ 1,207,000	$ 1,469,000
California [Member]
Schedule Of Deposits [Line Items]
Certificate of deposits, included in time certificates, over $250,000	$ 50,000,000	$ 60,000,000

Commitments and Contingencies -

Commitments and Contingencies - Summary of Bank's Commitments and Contingent Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit
Construction [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	232,385	248,996
RE Mortgage [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	163,733	140,292
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	11,743	11,346
Commercial [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	316,382	306,191
Consumer Loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	514,413	496,575
Deposit Account Overdraft Privilege [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	$ 115,552	$ 111,956

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Aug. 21, 2007
Class of Stock [Line Items]
Cash dividends received	$ 8,114,000	$ 4,372,000
Repurchase of common stock					500,000
Common stock, shares outstanding	30,432,419		30,417,223
Market value of shares repurchased under equity compensation plans	$ 647,000	$ 4,000
2007 Stock Repurchase Plan [Member]
Class of Stock [Line Items]
Common stock, shares outstanding	0	0
Cumulative number of shares repurchased	196,566
Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares outstanding	30,432,419	22,956,323	30,417,223	22,955,963
Company's common stock in lieu of cash to exercise options to purchase shares	16,418	134
Market value of shares repurchased under equity compensation plans	$ 647,000	$ 4,000

Stock Options and Other Equit_3

Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options currently not exercisable yet expected to vest	1,125
Restricted Stock Units (RSUs) [Member] | Market Plus Service Condition Vesting RSUs [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of units outstanding expected to vest	45,536	45,536
Weighted-average remaining contractual term	1 year 2 months 12 days
Pre-tax compensation costs	$ 633,000
Restricted Stock Units (RSUs) [Member] | Service Condition Vesting RSUs [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of units outstanding expected to vest	66,914	66,947
Options available for grant under the plan	66,914
Weighted-average remaining contractual term	1 year 2 months 12 days
Pre-tax compensation costs	$ 1,465,000
Number of units released	355
Maximum [Member] | Restricted Stock Units (RSUs) [Member] | Market Plus Service Condition Vesting RSUs [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of units released	68,304

Stock Options and Other Equit_4

Stock Options and Other Equity-Based Incentive Instruments - Stock Option Activity (Detail)	3 Months Ended
	Mar. 31, 2019$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, Number of Shares, beginning balance | shares	343,000
Options exercised, Number of Shares | shares	(41,000)
Options outstanding, Number of Shares, ending balance | shares	302,000
Options outstanding, Weighted Average Exercise Price, beginning balance	$ 16.67
Options exercised, Weighted Average Exercise Price	15.78
Options outstanding, Weighted Average Exercise Price, ending balance	16.88
Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, Option Price per Share, beginning balance	12.63
Options exercised, Option Price per Share	12.63
Options outstanding, Option Price per Share, ending balance	14.54
Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, Option Price per Share, beginning balance	23.21
Options exercised, Option Price per Share	19.46
Options outstanding, Option Price per Share, ending balance	$ 23.21

Stock Options and Other Equit_5

Stock Options and Other Equity-Based Incentive Instruments - Summary of Options Outstanding (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of options	302,000	343,000
Weighted average exercise price	$ 16.88	$ 16.67
Intrinsic value (in thousands)	$ 5,107
Weighted average remaining contractual term (yrs.)	3 years 4 months 24 days
Currently Exercisable [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of options	300,875
Weighted average exercise price	$ 16.86
Intrinsic value (in thousands)	$ 5,095
Weighted average remaining contractual term (yrs.)	3 years 4 months 24 days
Currently Not Exercisable [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of options	1,125
Weighted average exercise price	$ 23.21
Intrinsic value (in thousands)	$ 12
Weighted average remaining contractual term (yrs.)	5 years 9 months 18 days

Stock Options and Other Equit_6

Stock Options and Other Equity-Based Incentive Instruments - Restricted Stock Unit (RSU) Activity (Detail) - Restricted Stock Units (RSUs) [Member]	3 Months Ended
	Mar. 31, 2019shares
Market Plus Service Condition Vesting RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs outstanding, Number of RSUs, beginning balance	45,536
RSUs outstanding, Number of RSUs, ending balance	45,536
Service Condition Vesting RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs outstanding, Number of RSUs, beginning balance	66,947
RSUs added through dividend credits, Number of RSUs	322
RSUs released through vesting, Number of RSUs	(355)
RSUs outstanding, Number of RSUs, ending balance	66,914

Noninterest Income and Expens_2

Noninterest Income and Expense - Components of Other Noninterest Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	$ 9,070	$ 9,356
Increase in cash value of life insurance	775	608
Asset management and commission income	642	876
Gain on sale of loans	412	626
Lease brokerage income	220	128
Sale of customer checks	140	101
Gain on sale of foreclosed assets	99	371
Gain (loss) on marketable equity securities	36	(48)
Loss on disposal of fixed assets	(38)	(13)
Other	508	285
Total other noninterest income	2,794	2,934
Total noninterest income	11,864	12,290
ATM and Interchange Fees [Member]
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	4,581	4,235
Service Charges on Deposit Accounts [Member]
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	3,880	3,779
Other Service Fees [Member]
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	771	714
Mortgage Banking Service Fees [Member]
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	483	517
Change in Value of Mortgage Servicing Rights [Member]
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	$ (645)	$ 111

Noninterest Income and Expens_3

Noninterest Income and Expense - Components of Noninterest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Base salaries, net of deferred loan origination costs	$ 16,757	$ 13,962
Incentive compensation	2,567	2,452
Benefits and other compensation costs	5,804	5,238
Total salaries and benefits expense	25,128	21,652
Occupancy	3,774	2,681
Data processing and software	3,349	2,514
Equipment	1,867	1,551
Intangible amortization	1,431	339
Advertising	1,331	838
ATM and POS network charges	1,323	1,226
Professional fees	839	773
Telecommunications	797	701
Regulatory assessments and insurance	511	430
Merger and acquisition expense		476
Postage	310	358
Operational losses	225	294
Courier service	270	267
Other miscellaneous expense	4,358	4,062
Total other noninterest expense	20,385	16,510
Total noninterest expense	$ 45,513	$ 38,162

Earnings Per Share - Computatio

Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 22,726	$ 13,910
Average number of common shares outstanding	30,424	22,956
Effect of dilutive stock options and restricted stock	234	327
Average number of common shares outstanding used to calculate diluted earnings per share	30,658	23,283

Comprehensive Income - Componen

Comprehensive Income - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other Comprehensive Income (Loss)
Unrealized holding gains (losses) on available for sale securities before reclassifications	$ 12,710	$ (15,265)
Amounts reclassified out of accumulated other comprehensive income:
Total amounts reclassified out of accumulated other comprehensive income		(363)
Unrealized holding gains (losses) on available for sale securities after reclassifications	12,710	(15,628)
Tax effect	(3,758)	4,602
Unrealized holding gains (losses) on available for sale securities, net of tax	8,952	(11,026)
Change in unfunded status of the supplemental retirement plans before reclassifications	(89)	667
Amounts reclassified out of accumulated other comprehensive income:
Amortization of prior service cost	(13)	(13)
Amortization of actuarial losses	102	127
Total amounts reclassified out of accumulated other comprehensive income	89	(554)
Change in unfunded status of the supplemental retirement plans after reclassifications		113
Tax effect		(33)
Change in unfunded status of the supplemental retirement plans, net of tax		80
Other comprehensive income (loss)	$ 8,952	(10,946)
ASU 2016-01 [Member]
Amounts reclassified out of accumulated other comprehensive income:
Total amounts reclassified out of accumulated other comprehensive income		62
ASU 2018-02 [Member]
Amounts reclassified out of accumulated other comprehensive income:
Total amounts reclassified out of accumulated other comprehensive income		(425)
Amounts reclassified out of accumulated other comprehensive income:
Total amounts reclassified out of accumulated other comprehensive income		$ (668)

Comprehensive Income - Compon_2

Comprehensive Income - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (8,927)	$ (17,879)
Net Unrealized Loss on Available for Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, before tax	(8,264)	(20,974)
Accumulated other comprehensive loss, tax effect	2,443	6,201
Accumulated other comprehensive loss	(5,821)	(14,773)
Unfunded Status of Supplemental Retirement Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, before tax	(4,802)	(4,802)
Accumulated other comprehensive loss, tax effect	1,420	1,420
Accumulated other comprehensive loss	(3,382)	(3,382)
Joint Beneficiary Agreement Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, before tax	276	276
Accumulated other comprehensive loss	$ 276	$ 276

Fair Value Measurement - Record

Fair Value Measurement - Recorded Amount of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value Measurements on Recurring Basis [Member] - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 1,128,408	$ 1,128,695
Marketable Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,910	2,874
Obligations of U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	627,100	629,981
Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	129,349	126,072
Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	4,478	4,478
Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	352,589	354,505
Loans Held For Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	5,410	3,687
Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	6,572	7,098
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,910	2,874
Level 1 [Member] | Marketable Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,910	2,874
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	1,118,926	1,118,723
Level 2 [Member] | Obligations of U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	627,100	629,981
Level 2 [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	129,349	126,072
Level 2 [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	4,478	4,478
Level 2 [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	352,589	354,505
Level 2 [Member] | Loans Held For Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	5,410	3,687
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	6,572	7,098
Level 3 [Member] | Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 6,572	$ 7,098

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Transfers between level 1 to level 2, Assets	$ 0	$ 0
Transfers between level 2 to level 1, Assets	0	0
Transfers between level 1 to level 2, Liabilities	0	0
Transfers between level 2 to level 1, Liabilities	0	0
Transfer into level 3	0	0
Transfer out of level 3	0	$ 0
Carrying value of loans fully charged-off	$ 0

Fair Value Measurement - Reconc

Fair Value Measurement - Reconciliation of Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) on Recurring Basis (Detail) - Mortgage Servicing Rights [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 7,098	$ 6,687
Change Included in Earnings	(645)	111
Issuances	119	155
Ending Balance	$ 6,572	$ 6,953

Fair Value Measurement - Quanti

Fair Value Measurement - Quantitative Information about Recurring Level 3 Fair Value Measurements (Detail) - Mortgage Servicing Rights [Member] $ in Thousands	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgages Servicing Rights, Fair Value	$ 6,572	$ 7,098
Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Constant Prepayment Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Constant prepayment rate	5.4	5
Minimum [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Constant prepayment rate	12	12
Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Constant Prepayment Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Constant prepayment rate	27.1	27.3
Maximum [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Constant prepayment rate	13	13
Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Constant Prepayment Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Constant prepayment rate	8.9	7.6
Weighted Average [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Constant prepayment rate	12	12

Fair Value Measurement - Assets

Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Impaired Originated & PNCI Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 212		$ 281
Fair Value Nonrecurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	426	$ 2,877	1,592
Total Gains/(Losses)	(99)	(882)	(302)
Fair Value Nonrecurring Basis [Member] | Impaired Originated & PNCI Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	212	2,103	281
Total Gains/(Losses)	(197)	(795)	(294)
Fair Value Nonrecurring Basis [Member] | Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	214	774	1,311
Total Gains/(Losses)	98	(87)	(8)
Fair Value Nonrecurring Basis [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	426	2,877	1,592
Fair Value Nonrecurring Basis [Member] | Level 3 [Member] | Impaired Originated & PNCI Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	212	2,103	281
Fair Value Nonrecurring Basis [Member] | Level 3 [Member] | Foreclosed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 214	$ 774	$ 1,311

Fair Value Measurement - Quan_2

Fair Value Measurement - Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Impaired Originated & PNCI Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 212	$ 281
Foreclosed Assets [Member] | Residential Real Estate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 214	693
Foreclosed Assets [Member] | Commercial Real Estate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 618
Level 3 [Member] | Sales Comparison Approach [Member] | Minimum [Member] | Impaired Originated & PNCI Loans [Member] | Adjustment for Differences between Comparable Sales [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average		(16.30%)
Level 3 [Member] | Sales Comparison Approach [Member] | Minimum [Member] | Foreclosed Assets [Member] | Residential Real Estate [Member] | Adjustment for Differences between Comparable Sales [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average		(21.83%)
Level 3 [Member] | Sales Comparison Approach [Member] | Minimum [Member] | Foreclosed Assets [Member] | Commercial Real Estate [Member] | Adjustment for Differences between Comparable Sales [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average		(65.00%)
Level 3 [Member] | Sales Comparison Approach [Member] | Maximum [Member] | Impaired Originated & PNCI Loans [Member] | Adjustment for Differences between Comparable Sales [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average		35.14%
Level 3 [Member] | Sales Comparison Approach [Member] | Maximum [Member] | Foreclosed Assets [Member] | Residential Real Estate [Member] | Adjustment for Differences between Comparable Sales [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average		7.25%
Level 3 [Member] | Sales Comparison Approach [Member] | Maximum [Member] | Foreclosed Assets [Member] | Commercial Real Estate [Member] | Adjustment for Differences between Comparable Sales [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average		20.00%
Level 3 [Member] | Sales Comparison Approach [Member] | Weighted Average [Member] | Impaired Originated & PNCI Loans [Member] | Adjustment for Differences between Comparable Sales [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average		10.45%
Level 3 [Member] | Sales Comparison Approach [Member] | Weighted Average [Member] | Foreclosed Assets [Member] | Residential Real Estate [Member] | Adjustment for Differences between Comparable Sales [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average		(3.75%)
Level 3 [Member] | Sales Comparison Approach [Member] | Weighted Average [Member] | Foreclosed Assets [Member] | Commercial Real Estate [Member] | Adjustment for Differences between Comparable Sales [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average		(45.00%)

Fair Value Measurement - Estima

Fair Value Measurement - Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financial assets:
Cash and due from banks	$ 105,103	$ 119,781
Cash at Federal Reserve and other banks	213,605	107,752
Securities held to maturity	431,016	444,936
Loans held for sale	5,410	3,687
Financial liabilities:
Other borrowings	12,466	15,839
Junior subordinated debt	57,085	57,042
Level 3 [Member] | Overdraft Privilege Commitments [Member]
Off-balance sheet:
Contract amount, Off-balance sheet	115,552	111,956
Level 3 [Member] | Standby Letters of Credit [Member]
Off-balance sheet:
Contract amount, Off-balance sheet	11,743	11,346
Level 3 [Member] | Commitments [Member]
Off-balance sheet:
Contract amount, Off-balance sheet	1,226,913	1,192,054
Fair Value [Member] | Level 3 [Member]
Financial assets:
Loans, net	4,053,496	4,006,986
Financial liabilities:
Junior subordinated debt	56,180	62,610
Fair Value [Member] | Level 3 [Member] | Overdraft Privilege Commitments [Member]
Off-balance sheet:
Fair value, Off-balance sheet	1,156	1,120
Fair Value [Member] | Level 3 [Member] | Standby Letters of Credit [Member]
Off-balance sheet:
Fair value, Off-balance sheet	117	113
Fair Value [Member] | Level 3 [Member] | Commitments [Member]
Off-balance sheet:
Fair value, Off-balance sheet	12,269	11,921
Fair Value [Member] | Level 1 [Member]
Financial assets:
Cash and due from banks	105,103	119,781
Cash at Federal Reserve and other banks	213,605	107,752
Fair Value [Member] | Level 2 [Member]
Financial assets:
Securities held to maturity	430,773	437,370
Loans held for sale	5,410	4,616
Financial liabilities:
Deposits	5,427,004	5,362,173
Other borrowings	12,466	15,839
Carrying Amount [Member] | Level 3 [Member]
Financial assets:
Loans, net	4,002,267	3,989,432
Financial liabilities:
Junior subordinated debt	57,085	57,042
Carrying Amount [Member] | Level 1 [Member]
Financial assets:
Cash and due from banks	105,103	119,781
Cash at Federal Reserve and other banks	213,605	107,752
Carrying Amount [Member] | Level 2 [Member]
Financial assets:
Securities held to maturity	431,016	444,936
Restricted equity securities	17,250	17,250
Loans held for sale	5,410	3,687
Financial liabilities:
Deposits	5,430,262	5,366,466
Other borrowings	$ 12,466	$ 15,839

Regulatory Matters - Actual and

Regulatory Matters - Actual and Required Capital Ratios of Bank (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	8.00%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%	6.50%
Tier 1 Capital (to Average Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%
Parent [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Actual, Amount	$ 700,542	$ 682,419
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	665,688	647,262
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	610,317	591,933
Tier 1 Capital (to Average Assets), Actual, Amount	$ 665,688	$ 647,262
Total Capital (to Risk Weighted Assets), Actual, Ratio	14.73%	14.40%
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	14.00%	13.66%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	12.83%	12.49%
Tier 1 Capital (to Average Assets), Actual, Ratio	10.84%	10.68%
Parent [Member] | Basel III Phase-in Schedule [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount		$ 467,874
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount		373,115
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount		302,045
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount		$ 242,452
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio		9.875%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio		7.875%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio		6.375%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio		4.00%
Parent [Member] | Basel III Fully Phased In [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	$ 449,380	$ 497,486
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	404,260	402,727
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	332,920	331,658
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	$ 245,649	$ 242,452
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	10.50%	10.50%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	8.50%	8.50%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	7.00%	7.00%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio	4.00%	4.00%
Tri Countries Bank [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Actual, Amount	$ 697,549	$ 680,624
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	662,695	645,467
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	662,695	645,467
Tier 1 Capital (to Average Assets), Actual, Amount	$ 662,695	$ 645,467
Total Capital (to Risk Weighted Assets), Actual, Ratio	14.67%	14.37%
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	13.94%	13.63%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	13.94%	13.63%
Tier 1 Capital (to Average Assets), Actual, Ratio	10.79%	10.65%
Total Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 475,424	$ 473,624
Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	380,339	378,899
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	309,026	307,856
Tier 1 Capital (to Average Assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	307,054	303,059
Tri Countries Bank [Member] | Basel III Phase-in Schedule [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount		467,704
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount		372,979
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount		301,935
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount		$ 242,447
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio		9.875%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio		7.875%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio		6.375%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio		4.00%
Tri Countries Bank [Member] | Basel III Fully Phased In [Member]
Schedule of Capitalization [Line Items]
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	499,195	$ 497,305
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	404,111	402,581
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	332,797	331,537
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	$ 245,643	$ 242,447
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	10.50%	10.50%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	8.50%	8.50%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	7.00%	7.00%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio	4.00%	4.00%