LegacyTexas Financial 10-Q 25 Apr 18 2018 Q1 Quarterly report Financial data

DOCUMENT AND ENTITY INFORMATION

DOCUMENT AND ENTITY INFORMATION - shares	3 Months Ended
	Mar. 31, 2018	Apr. 23, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	LegacyTexas Financial Group, Inc.
Entity Central Index Key	1,487,052
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		48,264,966

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and due from financial institutions	$ 51,824	$ 61,713
Short-term interest-bearing deposits in other financial institutions	243,080	231,743
Total cash and cash equivalents	294,904	293,456
Securities available for sale, at fair value	431,413	419,717
Securities held to maturity (fair value: March 31, 2018 — $156,034, December 31, 2017— $174,926)	156,898	173,509
Loans held for sale, at fair value	31,123	16,707
Loans held for investment:
Loans held for investment (net of allowance for loan losses of $74,508 at March 31, 2018 and $71,301 at December 31, 2017)	6,502,245	6,418,271
Loans held for investment - Warehouse Purchase Program	1,019,840	1,320,846
Total loans held for investment	7,522,085	7,739,117
Federal Home Loan Bank (FHLB) stock and other restricted securities, at cost	46,842	64,790
Bank-owned life insurance	57,999	57,684
Premises and equipment, net	70,427	69,693
Goodwill	178,559	178,559
Other assets	75,374	72,964
Total assets	8,865,624	9,086,196
Deposits
Non-interest-bearing demand	1,681,067	1,635,622
Interest-bearing demand	996,737	1,029,375
Savings and money market	2,707,046	2,735,296
Time	1,569,557	1,367,390
Total deposits	6,954,407	6,767,683
FHLB advances	604,562	1,043,163
Repurchase agreements	76,610	84,676
Subordinated debt	134,645	134,522
Accrued expenses and other liabilities	115,906	96,278
Total liabilities	7,886,130	8,126,322
Commitments and contingent liabilities (See Note 10)
Shareholders’ equity
Preferred stock, $.01 par value; 10,000,000 shares authorized; 0 shares issued — March 31, 2018 and December 31, 2017	0	0
Common stock, $.01 par value; 90,000,000 shares authorized; 48,264,966 shares issued — March 31, 2018 and 48,117,390 shares issued — December 31, 2017	483	481
Additional paid-in capital	609,046	603,884
Retained earnings	389,653	370,858
Accumulated other comprehensive income (loss), net	(7,899)	(3,429)
Unearned Employee Stock Ownership Plan (ESOP) shares; 1,178,855 shares at March 31, 2018 and 1,192,093 shares at December 31, 2017	(11,789)	(11,920)
Total shareholders’ equity	979,494	959,874
Total liabilities and shareholders’ equity	$ 8,865,624	$ 9,086,196

CONSOLIDATED BALANCE SHEETS (PA

CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Fair value of securities held to maturity	$ 156,034	$ 174,926
Allowance for loan losses on loans held for investment	$ 74,508	$ 71,301
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	90,000,000	90,000,000
Common Stock, shares issued (in shares)	48,264,966	48,117,390
Unearned Employee Stock Ownership Plan, shares (in shares)	1,178,855	1,192,093

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest and dividend income
Loans, including fees	$ 90,631	$ 83,103
Taxable securities	2,911	2,562
Nontaxable securities	675	755
Interest-bearing deposits in other financial institutions	969	732
FHLB and FRB stock and other	480	384
Total interest and dividend income	95,666	87,536
Interest expense
Deposits	12,032	7,110
FHLB advances	2,680	1,632
Repurchase agreements and other borrowings	2,341	2,246
Total interest expense	17,053	10,988
Net interest income	78,613	76,548
Provision for credit losses	15,663	22,301
Net interest income after provision for credit losses	62,950	54,247
Non-interest income
Service charges and other fees	7,927	8,431
Net gain on sale of mortgage loans held for sale	1,809	1,628
Bank-owned life insurance income	447	422
Net gain (loss) on securities transactions	(128)	(19)
Gain on sale and disposition of assets	2,213	1,399
Other	630	269
Total non-interest income	12,898	12,130
Non-interest expense
Salaries and employee benefits	27,076	24,444
Advertising	888	817
Occupancy and equipment	3,860	3,654
Outside professional services	1,250	1,156
Regulatory assessments	1,154	985
Data processing	4,703	3,895
Office operations	2,300	2,276
Other	2,648	2,525
Total non-interest expense	43,879	39,752
Income before income tax expense	31,969	26,625
Income tax expense	6,207	8,435
Net income	$ 25,762	$ 18,190
Earnings per share:
Basic (in dollars per share)	$ 0.55	$ 0.39
Diluted (in dollars per share)	0.54	0.38
Dividends declared (in dollars per share)	$ 0.16	$ 0.15

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 25,762	$ 18,190
Change in unrealized gains (losses) on securities available for sale	(4,845)	999
Reclassification of amount realized through securities transactions	128	19
Tax effect	988	(356)
Reclassification of income tax effects of the Tax Cuts and Jobs Act (see Note 9 for more information)	(741)	0
Other comprehensive income (loss), net of tax	(4,470)	662
Comprehensive income	$ 21,292	$ 18,852

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss), Net	Unearned ESOP Shares
Balance at Dec. 31, 2016	$ 885,365	$ 479	$ 589,408	$ 310,641	$ (2,713)	$ (12,450)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	18,190			18,190
Other comprehensive income (loss), net of tax	662				662
Dividends declared	(7,183)			(7,183)
ESOP shares earned	552		420			132
Share-based compensation expense	1,562		1,562
Activity in employee stock plans	769	0	769
Balance at Mar. 31, 2017	899,917	479	592,159	321,648	(2,051)	(12,318)
Balance at Dec. 31, 2017	959,874	481	603,884	370,858	(3,429)	(11,920)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25,762			25,762
Other comprehensive income (loss), net of tax	(4,470)				(4,470)
Reclassification of income tax effects of the Tax Cuts and Jobs Act (see Note 9 for more information)	741			741
Dividends declared	(7,708)			(7,708)
ESOP shares earned	578		447			131
Share-based compensation expense	2,055		2,055
Activity in employee stock plans	2,662	2	2,660
Balance at Mar. 31, 2018	$ 979,494	$ 483	$ 609,046	$ 389,653	$ (7,899)	$ (11,789)

CONSOLIDATED STATEMENTS OF CHA7

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (PARENTHETICAL) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]
Dividends declared (in dollars per share)	$ 0.16	$ 0.15
ESOP shares earned (in shares)	13,238	13,238
Activity in employee stock plans (in shares)	147,576	63,935

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net income	$ 25,762	$ 18,190
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	15,663	22,301
Depreciation and amortization	1,738	1,790
Deferred tax benefit	(460)	(2,541)
Premium amortization and accretion of securities, net	1,031	1,106
Accretion related to acquired loans	(513)	(943)
Net (gain) loss on securities transactions	128	19
ESOP compensation expense	578	552
Share-based compensation expense	2,055	1,562
Excess tax benefit on vesting of stock awards	528	832
Net gain on loans held for sale	(1,809)	(1,628)
Loans originated or purchased for sale	(49,428)	(39,927)
Proceeds from sale of loans held for sale	36,821	43,519
FHLB stock dividends	(171)	(120)
Bank-owned life insurance income	(447)	(422)
(Gain) on sale and disposition of repossessed assets, premises and equipment	64	(1,359)
Net change in deferred loan fees/costs	(1,250)	(5,073)
Net change in accrued interest receivable	274	1,125
Net change in other assets	(2,338)	(913)
Net change in other liabilities	19,979	58,515
Net cash provided by operating activities	48,205	96,585
Available-for-sale securities:
Maturities, prepayments and calls	118,661	766,985
Purchases	(136,007)	(794,153)
Held-to-maturity securities:
Maturities, prepayments and calls	16,385	9,591
Originations of Warehouse Purchase Program loans	(4,972,238)	(4,258,685)
Proceeds from pay-offs of Warehouse Purchase Program loans	5,273,244	4,467,053
Net change in loans held for investment, excluding Warehouse Purchase Program loans	(97,968)	(218,855)
Redemption of FHLB and Federal Reserve Bank stock and other	18,119	230
Purchases of premises and equipment	(2,320)	(781)
Proceeds from sale of assets	356	3,388
Net cash provided by (used in) investing activities	218,232	(25,227)
Cash flows from financing activities
Net change in deposits	186,724	14,170
Proceeds from FHLB advances	390,000	0
Repayments on FHLB advances	(828,601)	(3,487)
Repayments of borrowings	(8,066)	(9,811)
Payment of dividends	(7,708)	(7,183)
Activity in employee stock plans	2,662	769
Net cash (used in) financing activities	(264,989)	(5,542)
Net change in cash and cash equivalents	1,448	65,816
Beginning cash and cash equivalents	293,456	289,212
Ending cash and cash equivalents	294,904	355,028
Supplemental noncash disclosures:
Transfers from loans to other real estate owned	$ 122	$ 3,737

Basis of Financial Statement Pr

Basis of Financial Statement Presentation	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Financial Statement Presentation	Basis of Financial Statement Presentation The accompanying consolidated interim financial statements of LegacyTexas Financial Group, Inc. (the “Company”) have been prepared in accordance with U.S. generally accepted accounting principles ("US GAAP") and with the rules and regulations of the Securities and Exchange Commission for interim financial reporting. Accordingly, they do not include all of the information and footnotes required for complete financial statements. In the opinion of management, all normal and recurring adjustments which are considered necessary to fairly present the results for the interim periods presented have been included. Certain items in prior periods were reclassified to conform to the current presentation. These statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2017 (“ 2017 Form 10-K”). Interim results are not necessarily indicative of results for a full year. In preparing the financial statements, management is required to make estimates and assumptions that affect the recorded amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses for the period. Actual results could differ from those estimates. For further information with respect to significant accounting policies followed by the Company in preparation of its consolidated financial statements, refer to the 2017 Form 10-K. The accompanying Unaudited Consolidated Interim Financial Statements include the accounts of the Company, whose business primarily consists of the operations of its wholly owned subsidiary, LegacyTexas Bank (the “Bank”). All significant intercompany transactions and balances are eliminated in consolidation.

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition Revenue recognized from contracts with customers, which is accounted for under ASC 606, is entirely included in the Company's non-interest income. Interest income and certain types of non-interest income are not accounted for under ASC 606 as it is accounted for under other accounting standards. Significant revenue streams recognized by the Company from contracts with customers accounted for under ASC 606 for the three months ended March 31, 2018 and March 31, 2017 , are below: Three Months Ended March 31, 2018 2017 Card services income (a) $ 3,058 $ 2,842 Service charges on deposits (b) 1,773 1,838 Title income (c) 1,057 1,434 Gains (losses) on the sale of other real estate owned (d) (40 ) 45 (a) Card services income - Card services income includes interchange income, which is income earned by the Company for each transaction a cardholder performs at a merchant. This performance obligation is settled on a daily basis as transactions are processed. Card services income also includes revenue earned from companies who provide our customers with debit cards and/or provide card processing services in exchange for the Company’s promotion of their card programs to the Company's depositors. These payments are remitted based on contractual terms that dictate how much payment is remitted based on volume expectations. This performance obligation settles on a daily basis as our customers use cards and card processing services at merchants. (b) Service charges on deposits - The Company receives non-interest income for providing services related to deposit accounts, including fee income generated from non-sufficient funds transactions, wire transfers, ATM activity, and treasury management services. This income is recorded when incurred in the case of deposit account service charges or when collected in the case of miscellaneous one-time fees, like wire transfer fees. Since most deposit agreements have a day-to-day term, the performance obligation between the Company and the depositor is satisfied on a daily basis, or as incurred. (c) Title income - Title services offered by the Company through its wholly-owned subsidiary, LegacyTexas Title, consists of referring title insurance policies to other title companies and performing real estate closing duties for a set fee. The performance obligation (referring title policies to other title insurance agencies and handling customary closing services) settles daily at each real estate closing. (d) Gains/losses on the sale of other real estate owned - The performance obligation in the sale of other real estate owned typically will be delivery of control over the property to the buyer. If the Company is not providing financing, the transaction price is typically identified in the purchase and sale agreement. However, if the Company provides seller financing, the Company must determine a transaction price, depending on if the sale contract is at market terms and taking into account the credit risk inherent in the sales arrangement. The performance obligations described in (b), (c), and (d) above are typically related to contracts that have an original expected duration of less than one year. In regards to card services income, because the Company has a right to consideration from card service providers in the form of transaction-based and support income, and from cardholders in the form of interchange income in an amount that corresponds directly with the value to the card service provider and cardholder of the Company's performance completed to date, the Company recognizes revenue as incurred when transactions with merchants settle on a daily basis. The Company has made no significant judgments in applying the revenue guidance prescribed in ASC 606 that affect the determination of the amount and timing of revenue from the above-described contracts with customers. The Company has applied ASC 606 using the modified retrospective approach effective on January 1, 2018 to all existing contracts with customers covered under the scope of the standard. The Company did not have an aggregate effect of modification resulting from adoption of ASC 606, and no financial statement line items were affected by this change in accounting standard.

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share Basic earnings per common share is computed by dividing net income (which has been adjusted for distributed and undistributed earnings to participating securities) by the weighted-average number of common shares outstanding for the period, reduced for average unallocated ESOP shares and average unvested restricted stock awards. Unvested restricted stock awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of earnings per share pursuant to the two-class method described in Accounting Standards Codification ("ASC") 260-10-45-60B. Diluted earnings per common share reflects the potential dilution that could occur if securities or other contracts to issue common stock (such as stock awards and options) were exercised or converted to common stock, or resulted in the issuance of common stock that then shared in the Company’s earnings. Diluted earnings per common share is computed by dividing net income by the weighted-average number of common shares outstanding for the period increased for the dilutive effect of unexercised stock options and unvested restricted stock awards. The dilutive effect of the unexercised stock options and unvested restricted stock awards is calculated under the treasury stock method utilizing the average market value of the Company’s stock for the period. A reconciliation of the numerator and denominator of the basic and diluted earnings per common share computation for the three months ended March 31, 2018 and 2017 is as follows: Three Months Ended March 31, 2018 2017 Basic earnings per share: Numerator: Net income $ 25,762 $ 18,190 Distributed and undistributed earnings to participating securities (75 ) (79 ) Income available to common shareholders $ 25,687 $ 18,111 Denominator: Weighted average common shares outstanding 48,197,596 47,897,062 Less: Average unallocated ESOP shares (1,187,533 ) (1,240,486 ) Average unvested restricted stock awards (137,730 ) (202,918 ) Average shares for basic earnings per share 46,872,333 46,453,658 Basic earnings per common share $ 0.55 $ 0.39 Diluted earnings per share: Numerator: Income available to common shareholders $ 25,687 $ 18,111 Denominator: Average shares for basic earnings per share 46,872,333 46,453,658 Dilutive effect of share-based compensation plan 692,254 606,648 Average shares for diluted earnings per share 47,564,587 47,060,306 Diluted earnings per common share $ 0.54 $ 0.38 Share awards excluded in the computation of diluted earnings per share because the exercise price was greater than the common stock average market price and were therefore antidilutive 184,000 129,008

Securities

Securities	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Securities	Securities The amortized cost, related gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) and the fair value of securities available for sale ("AFS") were as follows: March 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Agency residential mortgage-backed securities 1 $ 181,361 $ 350 $ 4,407 $ 177,304 Agency commercial mortgage-backed securities 1 9,344 — 211 9,133 Agency residential collateralized mortgage obligations 1 216,747 34 5,449 211,332 US government and agency securities 1,500 46 — 1,546 Municipal bonds 32,460 45 407 32,098 Total securities $ 441,412 $ 475 $ 10,474 $ 431,413 December 31, 2017 Agency residential mortgage-backed securities 1 $ 191,216 $ 419 $ 2,169 $ 189,466 Agency commercial mortgage-backed securities 1 9,360 — 125 9,235 Agency residential collateralized mortgage obligations 1 187,637 4 3,425 184,216 US government and agency securities 1,590 81 — 1,671 Municipal bonds 35,196 241 308 35,129 Total securities $ 424,999 $ 745 $ 6,027 $ 419,717 1 Mortgage-backed securities and collateralized mortgage obligations are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. The amortized cost (carrying amount), unrealized gains and losses and fair value of securities held to maturity ("HTM") were as follows: March 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Agency residential mortgage-backed securities 1 $ 53,674 $ 421 $ 1,246 $ 52,849 Agency commercial mortgage-backed securities 1 20,681 42 248 20,475 Agency residential collateralized mortgage obligations 1 24,630 159 141 24,648 Municipal bonds 57,913 772 623 58,062 Total securities $ 156,898 $ 1,394 $ 2,258 $ 156,034 December 31, 2017 Agency residential mortgage-backed securities 1 $ 57,334 $ 616 $ 646 $ 57,304 Agency commercial mortgage-backed securities 1 27,435 589 98 27,926 Agency residential collateralized mortgage obligations 1 27,112 265 99 27,278 Municipal bonds 61,628 1,079 289 62,418 Total securities $ 173,509 $ 2,549 $ 1,132 $ 174,926 1 Mortgage-backed securities and collateralized mortgage obligations are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. The amortized cost (carrying amount) and fair value of held to maturity debt securities and the fair value of available for sale debt securities at March 31, 2018 by contractual maturity are set forth in the table below. Securities with contractual payments not due at a single maturity date, including mortgage-backed securities and collateralized mortgage obligations, are shown separately. HTM AFS Amortized Cost Fair Value Fair Value Due in one year or less $ 460 $ 463 $ 2,845 Due after one to five years 12,555 12,783 11,209 Due after five to ten years 42,803 42,779 15,770 Due after ten years 2,095 2,037 3,820 Agency residential mortgage-backed securities 53,674 52,849 177,304 Agency commercial mortgage-backed securities 20,681 20,475 9,133 Agency residential collateralized mortgage obligations 24,630 24,648 211,332 Total $ 156,898 $ 156,034 $ 431,413 Securities with a carrying value of $245,494 and $256,451 at March 31, 2018 and December 31, 2017 , respectively, were pledged to secure public deposits, repurchase agreements and for other purposes required or permitted by law. At March 31, 2018 and December 31, 2017 , there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies of U.S. Government Sponsored Enterprises, in an amount greater than 10% of shareholders' equity. There were no sales of securities during the three months ended March 31, 2018 or 2017 . Securities with unrealized losses at March 31, 2018 and December 31, 2017 , aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows: AFS Less than 12 Months 12 Months or More Total March 31, 2018 Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Agency residential mortgage-backed securities 1 $ 58,594 $ 1,326 $ 91,249 $ 3,081 $ 149,843 $ 4,407 Agency commercial mortgage-backed securities 1 9,134 211 — — 9,134 211 Agency residential collateralized mortgage obligations 1 141,955 3,235 52,868 2,214 194,823 5,449 Municipal bonds 18,694 284 3,719 123 22,413 407 Total temporarily impaired $ 228,377 $ 5,056 $ 147,836 $ 5,418 $ 376,213 $ 10,474 December 31, 2017 Agency residential mortgage-backed securities 1 $ 59,545 $ 412 $ 100,214 $ 1,757 $ 159,759 $ 2,169 Agency commercial mortgage-backed securities 1 9,235 125 — — 9,235 125 Agency residential collateralized mortgage obligations 1 128,869 1,860 49,171 1,565 178,040 3,425 Municipal bonds 10,114 72 6,583 236 16,697 308 Total temporarily impaired $ 207,763 $ 2,469 $ 155,968 $ 3,558 $ 363,731 $ 6,027 HTM Less than 12 Months 12 Months or More Total March 31, 2018 Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Agency residential mortgage-backed securities 1 $ 19,773 $ 530 $ 15,838 $ 716 $ 35,611 $ 1,246 Agency commercial mortgage-backed securities 1 15,222 121 3,405 127 18,627 248 Agency residential collateralized mortgage obligations 1 9,274 106 2,003 35 11,277 141 Municipal bonds 11,469 243 10,296 380 21,765 623 Total temporarily impaired $ 55,738 $ 1,000 $ 31,542 $ 1,258 $ 87,280 $ 2,258 December 31, 2017 Agency residential mortgage-backed securities 1 $ 20,397 $ 206 $ 16,909 $ 440 $ 37,306 $ 646 Agency commercial mortgage-backed securities 1 3,685 26 3,484 72 7,169 98 Agency residential collateralized mortgage obligations 1 8,008 64 2,267 35 10,275 99 Municipal bonds 9,313 80 10,486 209 19,799 289 Total temporarily impaired $ 41,403 $ 376 $ 33,146 $ 756 $ 74,549 $ 1,132 1 Mortgage-backed securities and collateralized mortgage obligations are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. Other-than-Temporary Impairment In determining other-than-temporary impairment for debt securities, management considers many factors, including: (1) the length of time and the extent to which the fair value has been less than amortized cost; (2) the financial condition and near-term prospects of the issuer; (3) whether the market decline was affected by macroeconomic conditions; and (4) whether the Company has the intent and ability to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value. As of March 31, 2018 , 298 securities had unrealized losses, 117 of which had been in an unrealized loss position for over 12 months at March 31, 2018 . The Company does not believe these unrealized losses are other-than-temporary and expects full collection of the carrying amount of these securities. At March 31, 2018 , the Company does not intend to sell the securities in an unrealized loss position, and it is not more-likely-than-not that the Company will be required to sell the securities prior to recovery of amortized cost. All principal and interest payments are being received on time and in full.

Loans

Loans	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Loans	Loans Loans consist of the following. All periods presented in this note include a reclassification of three Warehouse relationships from the commercial and industrial category to the Warehouse Purchase Program category. At March 31, 2018 and December 31, 2017 , these reclassified relationships totaled $144,270 and $166,258 , respectively. March 31, December 31, 2017 Loans held for sale, at fair value $ 31,123 $ 16,707 Loans held for investment: Commercial real estate $ 3,053,750 $ 3,019,339 Commercial and industrial 1,967,443 1,927,049 Construction and land 252,213 277,864 Consumer real estate 1,252,433 1,213,434 Other consumer 43,284 45,506 Gross loans held for investment, excluding Warehouse Purchase Program 6,569,123 6,483,192 Net of: Deferred costs (fees) and discounts, net 7,630 6,380 Allowance for loan losses (74,508 ) (71,301 ) Net loans held for investment, excluding Warehouse Purchase Program 6,502,245 6,418,271 Warehouse Purchase Program 1,019,840 1,320,846 Total loans held for investment $ 7,522,085 $ 7,739,117 Activity in the allowance for loan losses for the three months ended March 31, 2018 and 2017 , segregated by portfolio segment and evaluation for impairment, is set forth below. The below activity does not include Warehouse Purchase Program loans, which are collectively evaluated for impairment and are purchased under several contractual requirements, providing safeguards to the Company. To date, the Company has not experienced a loss on its Warehouse Purchase Program loans and no allowance for loan losses has been allocated to them. At March 31, 2018 and 2017 , the allowance for loan impairment related to purchased credit impaired ("PCI") loans totaled $314 and $225 , respectively. For the three months ended March 31, 2018 Commercial Real Estate Commercial and Industrial Construction and Land Consumer Real Estate Other Consumer Total Allowance for loan losses: Beginning balance $ 21,587 $ 39,005 $ 4,644 $ 4,838 $ 1,227 $ 71,301 Charge-offs (3 ) (12,236 ) — — (288 ) (12,527 ) Recoveries — 22 — 11 66 99 Provision expense (benefit) (46 ) 15,973 (706 ) 180 234 15,635 Ending balance $ 21,538 $ 42,764 $ 3,938 $ 5,029 $ 1,239 $ 74,508 Allowance ending balance: Individually evaluated for impairment $ 56 $ 11,250 $ — $ 226 $ 30 $ 11,562 Collectively evaluated for impairment 21,482 31,514 3,938 4,803 1,209 62,946 Loans: Individually evaluated for impairment 3,748 40,453 — 2,911 23 47,135 Collectively evaluated for impairment 3,047,695 1,926,847 252,213 1,248,769 43,080 6,518,604 PCI loans 2,307 143 — 753 181 3,384 Ending balance $ 3,053,750 $ 1,967,443 $ 252,213 $ 1,252,433 $ 43,284 $ 6,569,123 For the three months ended March 31, 2017 Commercial Real Estate Commercial and Industrial Construction and Land Consumer Real Estate Other Consumer Total Allowance for loan losses: Beginning balance $ 18,303 $ 35,464 $ 5,075 $ 4,484 $ 1,250 $ 64,576 Charge-offs (16 ) (16,530 ) (418 ) (35 ) (247 ) (17,246 ) Recoveries 205 40 — 12 369 626 Provision expense (benefit) 866 21,912 (98 ) (76 ) 96 22,700 Ending balance $ 19,358 $ 40,886 $ 4,559 $ 4,385 $ 1,468 $ 70,656 Allowance ending balance: Individually evaluated for impairment $ 37 $ 9,337 $ — $ 180 $ 371 $ 9,925 Collectively evaluated for impairment 19,321 31,549 4,559 4,205 1,097 60,731 Loans: Individually evaluated for impairment 4,336 94,494 310 2,783 973 102,896 Collectively evaluated for impairment 2,776,564 1,735,969 289,948 1,105,793 49,520 5,957,794 PCI loans 5,577 208 — 883 229 6,897 Ending balance $ 2,786,477 $ 1,830,671 $ 290,258 $ 1,109,459 $ 50,722 $ 6,067,587 The allowance for loan losses and related provision expense are susceptible to change if the credit quality of our loan portfolio changes, which is evidenced by many factors, including but not limited to charge-offs and non-performing loan trends. Generally, consumer real estate lending has a lower credit risk profile compared to other consumer lending (such as automobile loans). Commercial real estate and commercial and industrial lending, however, can have higher risk profiles than consumer loans due to these loans being larger in amount and non-homogeneous in structure and term. Changes in economic conditions, the mix and size of the loan portfolio, and individual borrower conditions can dramatically impact our level of allowance for loan losses in relatively short periods of time. The allowance for loan losses is maintained to cover incurred losses that are estimated in accordance with US GAAP. It is our estimate of credit losses inherent in our loan portfolio at each balance sheet date. Our methodology for analyzing the allowance for loan losses consists of general and specific components. For the general component, we stratify the loan portfolio into homogeneous groups of loans that possess similar loss potential characteristics and apply a loss ratio to these groups of loans to estimate the credit losses in the loan portfolio. We use both historical loss ratios and qualitative loss factors assigned to major loan collateral types to establish general component loss allocations, inclusive of estimated loss emergence periods. Qualitative loss factors are based on management's judgment of company, market, industry or business specific data and external economic indicators, which are not yet reflected in the historical loss ratios, and that could impact the Company's specific loan portfolios. The Allowance for Loan Loss Committee sets and adjusts qualitative loss factors by regularly reviewing changes in underlying loan composition and the seasonality of specific portfolios. The Allowance for Loan Loss Committee also considers credit quality and trends relating to delinquency, non-performing and adversely rated loans within the Company's loan portfolio when evaluating qualitative loss factors. Additionally, the Allowance for Loan Loss Committee adjusts qualitative factors to account for the potential impact of external economic factors, including the unemployment rate, vacancy and capitalization rates and other pertinent economic data specific to our primary market area and lending portfolios. For the specific component, the allowance for loan losses includes loans where management has concerns about the borrower's ability to repay and on individually analyzed loans found to be impaired. Management evaluates current information and events regarding a borrower's ability to repay its obligations and considers a loan to be impaired when the ultimate collectability of amounts due, according to the contractual terms of the loan agreement, is in doubt. If an impaired loan is collateral-dependent, the fair value of the collateral, less the estimated cost to sell, is used to determine the amount of impairment. If an impaired loan is not collateral-dependent, estimated discounted cash flows are used to determine the amount of impairment, if any. For impaired loans, the amount of the impairment can be adjusted, based on current data, until such time as the actual basis is established by acquisition of the collateral or until the basis is collected. Impairment losses are reflected in the allowance for loan losses through a charge to the provision for credit losses. Subsequent recoveries are credited to the allowance for loan losses. Cash receipts for accruing loans are applied to principal and interest under the contractual terms of the loan agreement. Cash receipts on impaired loans for which the accrual of interest has been discontinued are applied first to principal. Large groups of smaller-balance homogeneous loans are collectively evaluated for impairment. As a result, the Company does not separately identify consumer real estate loans less than $417 or individual consumer non-real estate secured loans for impairment disclosures. The Company considers these loans to be homogeneous in nature due to the smaller dollar amount and the similar underwriting criteria. Changes in the allowance for off-balance sheet credit losses on lending-related commitments and guarantees on credit card debt, included in "accrued expenses and other liabilities" on the consolidated balance sheets, are summarized in the following table. Please see Note 10 - Commitments and Contingent Liabilities for more information. Three Months Ended March 31, 2018 2017 Beginning Balance $ 929 $ 1,573 Charge-offs on lending-related commitments — — Provision (benefit) for credit losses on lending-related commitments 28 (399 ) Ending Balance $ 957 $ 1,174 Impaired loans at March 31, 2018 and December 31, 2017 , were as follows 1 : March 31, 2018 Unpaid Recorded Recorded Total Recorded Investment Related Commercial real estate $ 4,069 $ 3,748 $ — $ 3,748 $ — Commercial and industrial 42,309 17,111 23,342 40,453 11,234 Consumer real estate 3,472 2,905 6 2,911 6 Other consumer 61 11 12 23 8 Total $ 49,911 $ 23,775 $ 23,360 $ 47,135 $ 11,248 December 31, 2017 Commercial real estate $ 4,411 $ 4,134 $ — $ 4,134 $ — Commercial and industrial 89,713 48,463 35,542 84,005 10,502 Consumer real estate 3,545 2,985 7 2,992 7 Other consumer 71 16 19 35 13 Total $ 97,740 $ 55,598 $ 35,568 $ 91,166 $ 10,522 1 No Warehouse Purchase Program loans were impaired at March 31, 2018 or December 31, 2017 . Loans reported do not include PCI loans. Income on impaired loans for the three months ended March 31, 2018 and 2017 , was as follows 1 : Three Months Ended March 31, 2018 2017 Average Interest Average Interest Commercial real estate $ 3,879 $ 2 $ 4,966 $ 2 Commercial and industrial 63,294 — 88,076 — Construction and land — — 7,388 — Consumer real estate 2,952 8 3,042 3 Other consumer 29 1 297 1 Total $ 70,154 $ 11 $ 103,769 $ 6 1 Loans reported do not include PCI loans. Past due status is based on the contractual terms of the loan. Loans that are past due 30 days are considered delinquent. Interest income on loans is discontinued at the time the loan is 90 days delinquent unless the loan is well-secured and in process of collection. Non-mortgage consumer loans are typically charged off no later than 120 days past due. In all cases, loans are placed on nonaccrual status or charged-off at an earlier date if collection of principal or interest is considered doubtful. Nonaccrual loans include both smaller balance homogeneous loans that are collectively evaluated for impairment and larger individually classified impaired loans. All interest accrued but not received for loans placed on nonaccrual status is reversed against interest income. Subsequent receipts on non-accrual loans are recorded as a reduction of principal, and interest income is recorded only after principal recovery is reasonably assured. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. No loans past due over 90 days were still accruing interest at March 31, 2018 or December 31, 2017 . At March 31, 2018 , no PCI loans were considered non-performing loans. No Warehouse Purchase Program loans were non-performing at March 31, 2018 or December 31, 2017 . Non-performing (nonaccrual) loans were as follows: March 31, 2018 December 31, 2017 Commercial real estate $ 3,748 $ 4,134 Commercial and industrial 40,455 84,003 Consumer real estate 5,548 6,190 Other consumer 85 76 Total $ 49,836 $ 94,403 A loan that has been modified is considered a troubled debt restructuring (“TDR”) when two conditions are met: 1) the borrower is experiencing financial difficulty and 2) concessions are made for the borrower's benefit that would not otherwise be considered for a borrower or transaction with similar credit risk characteristics. Modifications to loan terms may include a modification of the contractual interest rate to a below-market rate (even if the modified rate is higher than the original rate), forgiveness of accrued interest, forgiveness of a portion of principal, an extended repayment period or a deed in lieu of foreclosure or other transfer of assets other than cash to fully or partially satisfy a debt. The Company's policy is to place all TDRs on nonaccrual for a minimum period of six months . Loans qualify for return to accrual status once they have demonstrated performance with the restructured terms of the loan agreement for a minimum of six months and the collection of principal and interest under the revised terms is deemed probable. All TDRs are considered to be impaired loans. The outstanding balances of TDRs are shown below: March 31, 2018 December 31, 2017 Nonaccrual TDRs (1) $ 17,117 $ 17,294 Performing TDRs (2) 732 768 Total $ 17,849 $ 18,062 Outstanding commitments to lend additional funds to borrowers with TDR loans — — 1 Nonaccrual TDR loans are included in the nonaccrual loan totals. 2 Performing TDR loans are loans that have been performing under the restructured terms for at least six months and the Company is accruing interest on these loans. The following tables provide the recorded balances of loans modified as a TDR during the three months ended March 31, 2018 and 2017 . For the three months ended March 31, 2018 Principal Deferrals Other Total Commercial and industrial $ 83 $ — $ 83 Total $ 83 $ — $ 83 For the three months ended March 31, 2017 Principal Deferrals Other Total Commercial and industrial $ — $ 14,592 (1) $ 14,592 Total $ — $ 14,592 $ 14,592 1 Reserve-based energy relationships where the primary modifications consisted of suspension of required borrowing base payments. No loans modified as a TDR during the three months ended March 31, 2018 or 2017 , experienced a subsequent payment default in the preceding twelve months. A payment default is defined as a loan that was 90 days or more past due. Loans acquired with evidence of credit quality deterioration at acquisition, for which it was probable that the Company would not be able to collect all contractual amounts due, were accounted for as PCI loans. The carrying amount of PCI loans included in the consolidated balance sheets and the related outstanding balances at March 31, 2018 and December 31, 2017 are set forth in the table below. The outstanding balance represents the total amount owed, including accrued but unpaid interest, and any amounts previously charged off. March 31, 2018 December 31, 2017 Carrying amount 1 $ 3,070 $ 3,295 Outstanding balance 3,804 3,992 1 The carrying amounts are reported net of allowance for loan losses of $314 and $269 as of March 31, 2018 and December 31, 2017 . Changes in the accretable yield for PCI loans for the three months ended March 31, 2018 and 2017 are as follows: Three Months Ended March 31, 2018 2017 Beginning balance $ 2,279 $ 2,515 Reclassifications (to) from nonaccretable 51 198 Disposals (64 ) — Accretion (99 ) (186 ) Balance at end of period $ 2,167 $ 2,527 Below is an analysis of the age of recorded investment in loans that were past due at March 31, 2018 and December 31, 2017 . No Warehouse Purchase Program loans were delinquent at March 31, 2018 or December 31, 2017 and therefore are not included in the following tables. March 31, 2018 30-59 Days Past Due 60-89 Days Past Due 90 Days and Greater Past Due Total Loans Past Due Current Loans 1 Total Loans Commercial real estate $ 40,817 $ — $ — $ 40,817 $ 3,012,933 $ 3,053,750 Commercial and industrial 2,891 122 1,340 4,353 1,963,090 1,967,443 Construction and land 891 — — 891 251,322 252,213 Consumer real estate 16,097 196 741 17,034 1,235,399 1,252,433 Other consumer 341 52 — 393 42,891 43,284 Total $ 61,037 $ 370 $ 2,081 $ 63,488 $ 6,505,635 $ 6,569,123 December 31, 2017 Commercial real estate $ 9,414 $ — $ 250 $ 9,664 $ 3,009,675 $ 3,019,339 Commercial and industrial 918 284 7,350 8,552 1,918,497 1,927,049 Construction and land 9,354 — — 9,354 268,510 277,864 Consumer real estate 16,436 2,928 1,367 20,731 1,192,703 1,213,434 Other consumer 891 34 2 927 44,579 45,506 Total $ 37,013 $ 3,246 $ 8,969 $ 49,228 $ 6,433,964 $ 6,483,192 1 Includes acquired PCI loans with a total carrying value of $3,371 and $3,338 at March 31, 2018 and December 31, 2017 , respectively. For loans collateralized by real property and commercial and industrial loans, credit exposure is monitored by internally assigned grades used for classification of loans. A loan is considered “special mention” when management has determined that there is a potential weakness that deserves management's close attention. Loans rated as "special mention" are not adversely classified according to regulatory classifications and do not expose the Company to sufficient risk to warrant adverse classification. A loan is considered “substandard” if it is inadequately protected by the current net worth and paying capacity of the obligor or the collateral pledged, if any. “Substandard” loans include those characterized by the “distinct possibility” that the insured institution will sustain “some loss” if the deficiencies are not corrected, and the loan may or may not meet the criteria for impairment. Loans classified as “doubtful” have all of the weaknesses of those classified as “substandard” with the added characteristic that the weaknesses present makes “collection or liquidation in full,” on the basis of currently existing facts, conditions and values, “highly questionable and improbable.” All other loans that do not fall into the above mentioned categories are considered “pass” loans. Updates to internally assigned grades are made monthly and/or upon significant developments. For other consumer loans (non-real estate), credit exposure is monitored by payment history of the loans. Non-performing other consumer loans are on nonaccrual status and are generally greater than 90 days past due. The recorded investment in loans by credit quality indicators at March 31, 2018 and December 31, 2017 , was as follows: Real Estate and Commercial and Industrial Credit Exposure Credit Risk Profile by Internally Assigned Grade March 31, 2018 Commercial Real Estate Commercial and Industrial Construction and Land Consumer Real Estate Grade: 1 Pass $ 3,026,208 $ 1,848,915 $ 252,213 $ 1,243,095 Special Mention 19,929 38,292 — 1,376 Substandard 7,613 80,196 — 7,196 Doubtful — 40 — 766 Total $ 3,053,750 $ 1,967,443 $ 252,213 $ 1,252,433 December 31, 2017 Grade: 1 Pass $ 2,980,656 $ 1,787,238 $ 277,864 $ 1,203,236 Special Mention 30,656 43,161 — 1,408 Substandard 8,027 96,546 — 7,762 Doubtful — 104 — 1,028 Total $ 3,019,339 $ 1,927,049 $ 277,864 $ 1,213,434 1 PCI loans are included in the substandard or doubtful categories. These categories are consistent with the "substandard" and "doubtful" categories as defined by regulatory authorities. Warehouse Purchase Program Credit Exposure All Warehouse Purchase Program loans were graded pass as of March 31, 2018 and December 31, 2017 . Other Consumer Credit Exposure Credit Risk Profile Based on Payment Activity March 31, 2018 December 31, 2017 Performing $ 43,199 $ 45,430 Non-performing 85 76 Total $ 43,284 $ 45,506

Fair Value

Fair Value	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value	Fair Value ASC 820, “Fair Value Measurements and Disclosures”, establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3: Prices or valuation techniques that require inputs that are both significant and unobservable in the market. These instruments are valued using the best information available, some of which is internally developed, and reflects a reporting entity’s own assumptions about the risk premiums that market participants would generally require and the assumptions they would use. Assets and Liabilities Measured on a Recurring Basis Assets and liabilities measured at fair value on a recurring basis are summarized below. Fair Value Measurements Using Level 2 March 31, 2018 December 31, 2017 Assets: Agency residential mortgage-backed securities $ 177,304 $ 189,466 Agency commercial mortgage-backed securities 9,133 9,235 Agency residential collateralized mortgage obligations 211,332 184,216 US government and agency securities 1,546 1,671 Municipal bonds 32,098 35,129 Total securities available for sale $ 431,413 $ 419,717 Loans held for sale 1 $ 31,123 $ 16,707 Derivative financial instruments: Interest rate lock commitments 445 358 Forward mortgage-backed securities trades — 7 Loan customer counterparty — — Financial institution counterparty 2,576 1,735 Liabilities: Derivative financial instruments: Interest rate lock commitments — — Forward mortgage-backed securities trades 118 18 Loan customer counterparty 2,576 1,735 Financial institution counterparty — — 1 At March 31, 2018 and December 31, 2017 , loans held for sale had an aggregate outstanding principal balance of $30,304 and $16,242 , respectively. There were no mortgage loans held for sale that were 90 days or greater past due or on non-accrual at March 31, 2018 or December 31, 2017 . The following methodologies were used to measure the fair value of financial assets and liabilities valued on a recurring basis: Securities available for sale - The fair values of securities available for sale are determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities (Level 2 inputs). Residential mortgage loans held for sale - Mortgage loans held for sale, which are sold on a servicing released basis, are valued using a market approach by utilizing either: (i) the fair value of securities backed by similar mortgage loans, adjusted for certain factors to approximate the fair value of a whole mortgage loan, including the value attributable to mortgage servicing and credit risk, (ii) current commitments to purchase loans or (iii) recent observable market trades for similar loans, adjusted to credit risk and other individual loan characteristics. As these prices are derived from market observable inputs, the Company classifies these valuations as Level 2 in the fair value disclosures. Interest income on mortgage loans held for sale is recognized based on the contractual rates and reflected in interest income on loans held for sale in the consolidated income statement. The Company has no continuing involvement in any residential mortgage loans sold. Derivative instruments: Interest rate lock commitments ("IRLCs") - The estimated fair values of IRLCs utilize current secondary market prices for underlying loans and estimated servicing value with similar coupons, maturity and credit quality, subject to the anticipated loan funding probability (Pull-through rate). The fair value of IRLCs is subject to change primarily due to changes in interest rates and the estimated Pull-through rate. These commitments are classified as Level 2 in the fair value disclosures, as the valuations are based on observable market inputs. Forward mortgage-backed securities trades - These forward mortgage-backed securities trades are exchange-traded or traded within highly active dealer markets. In order to determine the fair value of these instruments, the Company utilized the exchange price or dealer market price for the particular derivative contract; therefore these contracts are classified as Level 2. The estimated fair values are subject to change primarily due to changes in interest rates. Loan customer counterparty and financial institution counterparty - The Company also enters into certain interest rate derivative positions that are not designated as hedging instruments. The estimated fair value of these commercial loan interest rate swaps are obtained from a pricing service that provides the swaps' unwind value (Level 2 inputs). Please see Note 7 - Derivative Financial Instruments for more information. Assets and Liabilities Measured on a Non-Recurring Basis Assets measured at fair value on a non-recurring basis are summarized below. There were no liabilities measured at fair value on a non-recurring basis at March 31, 2018 or December 31, 2017 . Fair Value Measurements Using Level 3 March 31, 2018 December 31, 2017 Assets: Impaired loans $ 12,112 $ 25,046 Foreclosed assets: Commercial real estate 6,694 6,694 Construction and land 800 859 Consumer real estate — 192 Other 666 687 Methodologies used to measure the fair value of financial assets and liabilities valued on a non-recurring basis are shown below: Impaired loans - Impaired loans that are collateral dependent are measured for impairment using the fair value of the collateral adjusted by additional Level 3 inputs, such as discounts of market value, estimated marketing costs and estimated legal expenses. Impaired loans secured by real estate, receivables or inventory had discounts determined by management on an individual loan basis. Impaired loans that are not collateral dependent are measured for impairment by a discounted cash flow analysis using a net present value calculation that utilizes data from the loan file before and after the modification. Foreclosed assets - These loans are measured at the lower of book or fair value less costs to sell using third party appraisals, listing agreements or sale contracts, which may be adjusted by additional Level 3 inputs, such as discounts of market value, estimated marketing costs and estimated legal expenses. Management may also consider additional adjustments on specific properties due to the age of the appraisal, expected holding period, lack of comparable sales, or if the other real estate owned is a special use property. At March 31, 2018 , the Company had $704 in residential mortgage loans in the process of foreclosure. The Credit Risk Management department evaluates the valuations on impaired loans and foreclosed assets at least quarterly. The valuations on impaired loans are reviewed at least quarterly by the Allowance for Loan Loss Committee and are considered in the calculation of the allowance for loan losses. Unobservable inputs, such as discounts to collateral, are monitored and adjusted if market conditions change. Fair value of financial instruments not recorded at fair value The carrying amount and fair value information of financial instruments not recorded at fair value in their entirety on a recurring basis on the Company's consolidated balance sheets at March 31, 2018 and at December 31, 2017 , were as follows: Fair Value Measurement Using March 31, 2018 Carrying Amount Level 1 Level 2 Level 3 Financial assets Cash and cash equivalents $ 294,904 $ 294,904 $ — $ — Securities held to maturity 156,898 — 156,034 — Loans held for investment, net 6,502,245 — — 6,486,126 Loans held for investment - Warehouse Purchase Program 1,019,840 — — 1,019,778 FHLB and other restricted securities, at cost 46,842 — 46,842 — Accrued interest receivable 24,322 24,322 — — Financial liabilities Deposits $ 6,954,407 $ — $ — $ 6,407,215 FHLB advances 604,562 — — 604,758 Repurchase agreements 76,610 — — 72,920 Subordinated debt 134,645 — — 142,531 Accrued interest payable 4,608 4,608 — — December 31, 2017 Financial assets Cash and cash equivalents $ 293,456 $ 293,456 $ — $ — Securities held to maturity 173,509 — 174,926 — Loans held for investment, net 6,418,271 — — 6,484,949 Loans held for investment - Warehouse Purchase Program 1,320,846 — — 1,337,612 FHLB and other restricted securities, at cost 64,790 — 64,790 — Accrued interest receivable 24,596 24,596 — — Financial liabilities Deposits $ 6,767,683 $ — $ — $ 6,326,572 FHLB advances 1,043,163 — — 1,043,416 Repurchase agreement 84,676 — — 81,041 Subordinated debt 134,522 — — 141,972 Accrued interest payable 2,729 2,729 — — ` The following methods and assumptions were used to estimate the fair values of each class of financial instrument presented: Cash and cash equivalents - Due to their short term nature, the carrying amount approximates the estimated fair value. Securities held to maturity - The fair values of these securities is determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities (Level 2 inputs). Loans held for investment (including Warehouse Purchase Program loans) - Pursuant to the adoption of ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities , for values reported for the 2018 period, fair value is based on cash flows, adjusted for credit and prepayments, discounted using current market yields. For values reported prior to 2018, fair value is based on cash flows, adjusted for prepayments, discounted using then- current market offering rates, including a credit spread. FHLB stock and other restricted securities - The fair value on these securities is their cost basis due to restrictions on transferability. Accrued interest receivable - Due to their short term nature, the carrying amount approximates the estimated fair value. Deposits - Fair value is calculated using the FHLB advance curve to discount cash flows based on the estimated life of the deposits. FHLB advances - Fair value is calculated using the FHLB advance curve to discount cash flows based on the contractual repayment schedule. Repurchase agreement - The fair value is based on discounting the estimated cash flows using the current rate at which similar borrowings would be made with similar terms and remaining maturities. Subordinated debt - The estimated fair value is based on current market rates on similar debt in the market. Accrued interest payable - Due to their short term nature, the carrying amount approximates the estimated fair value. The fair value of off-balance sheet items is based on the current fees or costs that would be charged to enter into or terminate such arrangements and are not considered significant to this presentation.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The following table provides the outstanding notional balances and fair values of outstanding derivative positions at March 31, 2018 and December 31, 2017 . March 31, 2018 December 31, 2017 Outstanding Notional Balance Asset Derivative Fair Value Liability Derivative Fair Value Outstanding Notional Balance Asset Derivative Fair Value Liability Derivative Fair Value IRLCs $ 13,460 $ 445 $ — $ 10,337 $ 358 $ — Forward mortgage-backed securities trades 32,133 — 118 19,788 7 18 Commercial loan interest rate swaps and caps: Loan customer counterparty $ 113,904 $ — $ 2,576 $ 114,594 $ — $ 1,735 Financial institution counterparty 113,904 2,576 — 114,594 1,735 — These financial instruments are not designated as hedging instruments and are used for asset and liability management and commercial customers' financing needs. All derivatives are carried at fair value in either other assets or other liabilities. IRLCs - In the normal course of business, the Company enters into IRLCs with consumers to originate mortgage loans at a specified interest rate. These commitments, which contain fixed expiration dates, offer the borrower an interest rate guarantee provided the loan meets underwriting guidelines and closes within the timeframe established by the Company. Forward mortgage-backed securities trades - The Company manages the changes in fair value associated with changes in interest rates related to IRLCs by using forward sold commitments known as forward mortgage-backed securities trades. These instruments are typically entered into at the time the IRLC is made. Interest rate swaps and caps - These derivative positions relate to transactions in which we enter into an interest rate swap or cap with a customer, while at the same time entering into an offsetting interest rate swap or cap with another financial institution. An interest rate swap transaction allows our customer to effectively convert a variable rate loan to a fixed rate. In connection with each swap, we agree to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on a similar notional amount at a fixed interest rate. At the same time, we agree to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. In connection with each interest rate cap, we sell a cap to the customer and agree to pay interest if the underlying index exceeds the strike price defined in the cap agreement. Simultaneously we purchase a cap with matching terms from another financial institution which agrees to pay us if the underlying index exceeds the strike price. The commercial loan customer counterparty weighted average received and paid interest rates for interest rate swaps outstanding at March 31, 2018 and December 31, 2017 are presented in the following table. Weighted-Average Interest Rate March 31, 2018 December 31, 2017 Received Paid Received Paid Loan customer counterparty 2.51 % 2.86 % 2.52 % 2.54 % Our credit exposure on interest rate swaps is limited to the net favorable value of all swaps by each counterparty, which resulted in no credit exposure at March 31, 2018 and $32 at December 31, 2017. This credit exposure is partly mitigated as transactions with customers are generally secured by the collateral, if any, securing the underlying transaction being hedged. Our credit exposure, net of collateral pledged, relating to interest rate swaps with upstream financial institution counter-parties was approximately $2,617 at March 31, 2018 . A credit support annex is in place and allows the bank to call collateral from upstream financial institution counter-parties. Collateral levels are monitored and adjusted on a regular basis for changes in interest rate swap values. Our cash collateral pledged for interest rate swaps and included in our interest-bearing deposits, which totaled $1,950 at March 31, 2018 and $1,950 at December 31, 2017 , is in excess of our credit exposure. The initial and subsequent changes in the fair value of IRLCs and the forward sales of mortgage-back securities are recorded in net gain on sale of mortgage loans. These gains and losses were not attributable to instrument-specific credit risk. For interest rate swaps and caps, because we act as an intermediary for our customer, changes in the fair value of the underlying derivative contracts substantially offset each other and do not have a material impact on our results of operations. Income (loss) for the three months ended March 31, 2018 and 2017 was as follows: Derivatives not designated as hedging instruments Three Months Ended March 31, 2018 2017 IRLCs $ 87 $ 172 Forward mortgage-backed securities trades 399 (112 )

Share-based Compensation

Share-based Compensation	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Compensation	Share-based Compensation Compensation cost charged to income for share-based compensation is presented below. Three Months Ended March 31, 2018 2017 Restricted stock $ 1,064 $ 868 Stock options 991 694 Income tax benefit 432 547 A summary of non-vested share activity in the restricted stock portion of the Company's share-based compensation plans ("Plans") for the three months ended March 31, 2018 is presented below. Time-Vested Shares Performance-Based Shares Shares Weighted-Average Grant Date Fair Value per Share 1 Shares Weighted-Average Grant Date Fair Value per Share 2 Beginning balance 128,588 $ 27.27 73,008 $ 42.21 Granted 35,650 42.40 26,550 3 42.82 Vested (48,600 ) 21.27 (20,600 ) 44.04 Ending balance 115,638 $ 34.45 78,958 $ 42.82 1 For restricted stock awards with time-based vesting conditions, the grant date fair value is based upon the closing stock price as quoted on the Nasdaq Stock Market on the grant date. 2 For restricted stock awards with performance-based vesting conditions, the value of the award is based upon the closing stock price as quoted on the Nasdaq Stock Market on the date of vesting. Until the final value is determined on the vesting date, the Company estimates the fair value based upon the closing stock price as quoted on the Nasdaq Stock Market near the last business day of each month. 3 The 26,550 performance-based shares granted are represented in the table at target; however, if certain performance metrics are met at vesting, the shares may be awarded at up to 200% of their target amount, with an additional 20% increase or decrease in the total share award at vesting depending on the Company's Total Shareholder Return percentage for the determined period. As of March 31, 2018 , there was $5,067 of total unrecognized compensation expense related to non-vested restricted shares awarded under the Company's Plans. That expense is expected to be recognized over a weighted-average period of 1.8 years . A summary of activity in the stock option portion of the Company's Plans for the three months ended March 31, 2018 is presented below. Shares Weighted- Average Exercise Price per Share Weighted- Average Remaining Contractual Term Aggregate Intrinsic Value Beginning Balance 2,207,243 $ 26.88 10.1 $ 33,848 Exercised (111,926 ) 23.77 Forfeited (32,375 ) 31.41 Ending Balance 2,062,942 26.97 9.9 32,693 Fully vested and expected to vest 2,055,462 26.95 9.9 32,619 Exercisable at March 31, 2018 989,931 $ 22.41 7.1 $ 20,205 As of March 31, 2018 , there was $6,740 of total unrecognized compensation expense related to non-vested stock options. That expense is expected to be recognized over a weighted-average period of 1.8 years .

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Tax Cuts and Jobs Act (the "Act",) which was enacted on December 22, 2017, made key changes to the U.S. tax law, including the reduction of the U.S. federal corporate tax rate from 35% to 21%. As ASC 740, Income Taxes , requires the effects of changes in tax rates and laws on deferred tax balances to be recognized in the period in which the legislation is enacted, the Company remeasured its deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is 21%. The Company is still analyzing certain aspects of the Act, and refining its calculations, which could potentially affect the measurement of these balances or give rise to new deferred tax amounts. The provisional amount recorded in the 2017 period related to the remeasurement of our deferred tax asset was $13,493 . During the three months ended March 31, 2018 , the Company elected early adoption of the provisions of ASU 2018-02, which allowed the Company to reclassify the income tax effects of the Act on items within accumulated other comprehensive income to retained earnings. This reclassification, which reduced other comprehensive income and increased retained earnings by $741 , related entirely to unrealized gains and losses on available for sale securities. A summary of the net deferred tax assets as of March 31, 2018 and December 31, 2017 , is presented below: March 31, 2018 December 31, 2017 Net deferred tax assets $ 21,689 $ 20,240 Estimated annual effective tax rate 21 %

Commitments and Contingent Liab

Commitments and Contingent Liabilities	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Commitments and Contingent Liabilities In the normal course of business, the Company enters into various transactions which, in accordance with US GAAP, are not included in its consolidated balance sheets. The Company enters into these transactions to meet the financing needs of its customers. These transactions include commitments to extend credit and standby letters of credit which involve, to varying degrees, elements of credit and interest rate risk. Credit losses up to the face amount of these instruments could occur, although material losses are not anticipated. The Company's credit policies applied to loan originations are also applied to these commitment requests, including obtaining collateral at the exercise of the commitment. The contractual amounts of financial instruments with off‑balance sheet risk at March 31, 2018 and December 31, 2017 , are summarized below. Please see Part I-Item 2-"Off-Balance Sheet Arrangements, Contractual Obligations and Commitments" of this Form 10-Q for information related to commitment maturities. March 31, 2018 December 31, 2017 Unused commitments to extend credit $ 1,740,403 $ 1,600,794 Unused capacity on Warehouse Purchase Program loans 1,057,160 738,412 Standby letters of credit 33,403 34,091 Total unused commitments/capacity $ 2,830,966 $ 2,373,297 Unused commitments to extend credit - The Company enters into contractual commitments to extend credit, normally with fixed expiration dates or termination clauses, at specified rates and for specific purposes. Since many commitments expire without being drawn upon, the total contractual amount of commitments does not necessarily represent future cash requirements of the Company. Substantially all of the Company's commitments to extend credit are contingent upon customers maintaining specific credit standards at the time of future loan funding. Unused capacity on Warehouse Purchase Program loans - In regard to unused capacity on Warehouse Purchase Program loans, the Company has established maximum purchase facility amounts, but reserves the right, at any time, to refuse to buy any mortgage loans offered for sale by each customer, for any reason in the Company's sole and absolute discretion. Standby letters of credit - Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. In addition to the commitments above, the Company guarantees the credit card debt of certain customers to the merchant bank that issues the credit cards. These guarantees are in place for as long as the guaranteed credit card is open. At March 31, 2018 and December 31, 2017 , these credit card guarantees totaled $5,680 and $5,257 , respectively. This amount represents the maximum potential amount of future payments under the guarantee, which the Company is responsible for in the event of customer non-payment. The Company funds an allowance for credit losses on off-balance sheet lending-related commitments and guarantees on credit card debt through a charge to provision for credit losses on the Company's consolidated statement of income. At March 31, 2018 and December 31, 2017 , this allowance for credit losses on off-balance sheet lending-related commitments and guarantees on credit card debt, included in "other liabilities" on the Company's consolidated balance sheets, totaled $957 and $929 , respectively. In addition to the commitments above, the Company had overdraft protection available in the amounts of $85,860 and $84,727 at March 31, 2018 and December 31, 2017 , respectively. The Company, at March 31, 2018 and December 31, 2017 , had FHLB letters of credit of $1,021,510 and $944,370 , respectively, pledged to secure public deposits, repurchase agreements and for other purposes required or permitted by law. At March 31, 2018 and December 31, 2017 , the Company had $1,100 and $1,680 , respectively, of unfunded commitments recorded in other liabilities in its consolidated balance sheet related to investments in community development-oriented private equity funds used for Community Reinvestment Act purposes.

Recent Accounting Developments

Recent Accounting Developments	3 Months Ended
	Mar. 31, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Developments	Recent Accounting Developments Effect of Newly Issued But Not Yet Effective Accounting Standards In February 2016, the FASB issued ASU 2016-02, Leases . This ASU requires lessees to put most leases on their balance sheets but recognize expenses in the income statement in a manner similar to current accounting treatment. This ASU changes the guidance on sale-leaseback transactions, initial direct costs and lease execution costs, and, for lessors, modifies the classification criteria and the accounting for sales-type and direct financing leases. For public business entities, this ASU is effective for annual periods beginning after December 15, 2018, and interim periods therein. Entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. The Company is evaluating the impact of this ASU on its financial statements and disclosures. In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments. This ASU removes the thresholds that companies apply to measure credit losses on financial instruments measured at amortized cost, such as loans, receivables, and held-to-maturity debt securities. Under current US GAAP, companies generally recognize credit losses when it is probable that the loss has been incurred. This revised guidance will remove all recognition thresholds and will require companies to recognize an allowance for lifetime expected credit losses. Credit losses will be immediately recognized through net income; the amount recognized will be based on the current estimate of contractual cash flows not expected to be collected over the financial asset’s contractual term. ASU 2016-13 also amends the credit loss measurement guidance for available for sale debt securities. For public business entities, this ASU is effective for financial statements issued for fiscal years and for interim periods within those fiscal years beginning after December 15, 2019. The Company is evaluating the impact of this ASU on its financial statements and disclosures. In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities. This ASU amends the hedge accounting model to enable entities to better portray their risk management activities in their financial statements, by expanding an entity's ability to hedge nonfinancial and financial risk components and reduce complexity in fair value hedges of interest rate risk. This ASU eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. Additionally, this ASU also eases certain documentation and assessment requirements and modifies the accounting for components excluded from the assessment of hedge effectiveness. For public business entities, this ASU is effective for financial statements issued for fiscal years and for interim periods within those fiscal years beginning after December 15, 2018. The Company is evaluating the impact of this ASU on its financial statements and disclosures. In February 2018, the FASB issued ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. For public business entities, this ASU is effective for financial statements issued for fiscal years and for interim periods within those fiscal years beginning after December 15, 2018. Early adoption of the amendments in this ASU is permitted, including adoption in any interim period, (1) for public business entities for reporting periods for which financial statements have not yet been issued and (2) for all other entities for reporting periods for which financial statements have not yet been made available for issuance. The amendments in this ASU should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Cuts and Jobs Act is recognized. The Company elected early adoption of this ASU for the quarter ended March 31, 2018. Please see Note 9 - Income Taxes for more information about the adoption of this ASU.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company evaluated events from the date of the consolidated financial statements on March 31, 2018 through the issuance of those consolidated financial statements included in this Quarterly Report on Form 10-Q dated April 25, 2018 . No additional events were identified requiring recognition in and/or disclosures in the consolidated financial statements.

Basis of Financial Statement 21

Basis of Financial Statement Presentation (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Use of Estimates	In preparing the financial statements, management is required to make estimates and assumptions that affect the recorded amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses for the period. Actual results could differ from those estimates. For further information with respect to significant accounting policies followed by the Company in preparation of its consolidated financial statements, refer to the 2017 Form 10-K.
Consolidation	The accompanying Unaudited Consolidated Interim Financial Statements include the accounts of the Company, whose business primarily consists of the operations of its wholly owned subsidiary, LegacyTexas Bank (the “Bank”). All significant intercompany transactions and balances are eliminated in consolidation.
Revenue Recognition	(a) Card services income - Card services income includes interchange income, which is income earned by the Company for each transaction a cardholder performs at a merchant. This performance obligation is settled on a daily basis as transactions are processed. Card services income also includes revenue earned from companies who provide our customers with debit cards and/or provide card processing services in exchange for the Company’s promotion of their card programs to the Company's depositors. These payments are remitted based on contractual terms that dictate how much payment is remitted based on volume expectations. This performance obligation settles on a daily basis as our customers use cards and card processing services at merchants. (b) Service charges on deposits - The Company receives non-interest income for providing services related to deposit accounts, including fee income generated from non-sufficient funds transactions, wire transfers, ATM activity, and treasury management services. This income is recorded when incurred in the case of deposit account service charges or when collected in the case of miscellaneous one-time fees, like wire transfer fees. Since most deposit agreements have a day-to-day term, the performance obligation between the Company and the depositor is satisfied on a daily basis, or as incurred. (c) Title income - Title services offered by the Company through its wholly-owned subsidiary, LegacyTexas Title, consists of referring title insurance policies to other title companies and performing real estate closing duties for a set fee. The performance obligation (referring title policies to other title insurance agencies and handling customary closing services) settles daily at each real estate closing. (d) Gains/losses on the sale of other real estate owned - The performance obligation in the sale of other real estate owned typically will be delivery of control over the property to the buyer. If the Company is not providing financing, the transaction price is typically identified in the purchase and sale agreement. However, if the Company provides seller financing, the Company must determine a transaction price, depending on if the sale contract is at market terms and taking into account the credit risk inherent in the sales arrangement. The performance obligations described in (b), (c), and (d) above are typically related to contracts that have an original expected duration of less than one year. In regards to card services income, because the Company has a right to consideration from card service providers in the form of transaction-based and support income, and from cardholders in the form of interchange income in an amount that corresponds directly with the value to the card service provider and cardholder of the Company's performance completed to date, the Company recognizes revenue as incurred when transactions with merchants settle on a daily basis. The Company has made no significant judgments in applying the revenue guidance prescribed in ASC 606 that affect the determination of the amount and timing of revenue from the above-described contracts with customers. The Company has applied ASC 606 using the modified retrospective approach effective on January 1, 2018 to all existing contracts with customers covered under the scope of the standard. The Company did not have an aggregate effect of modification resulting from adoption of ASC 606, and no financial statement line items were affected by this change in accounting standard. Revenue recognized from contracts with customers, which is accounted for under ASC 606, is entirely included in the Company's non-interest income. Interest income and certain types of non-interest income are not accounted for under ASC 606 as it is accounted for under other accounting standards.
Other-than-Temporary Impairment	In determining other-than-temporary impairment for debt securities, management considers many factors, including: (1) the length of time and the extent to which the fair value has been less than amortized cost; (2) the financial condition and near-term prospects of the issuer; (3) whether the market decline was affected by macroeconomic conditions; and (4) whether the Company has the intent and ability to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value.
Allowance for Loan Losses	A loan that has been modified is considered a troubled debt restructuring (“TDR”) when two conditions are met: 1) the borrower is experiencing financial difficulty and 2) concessions are made for the borrower's benefit that would not otherwise be considered for a borrower or transaction with similar credit risk characteristics. Modifications to loan terms may include a modification of the contractual interest rate to a below-market rate (even if the modified rate is higher than the original rate), forgiveness of accrued interest, forgiveness of a portion of principal, an extended repayment period or a deed in lieu of foreclosure or other transfer of assets other than cash to fully or partially satisfy a debt. The Company's policy is to place all TDRs on nonaccrual for a minimum period of six months . Loans qualify for return to accrual status once they have demonstrated performance with the restructured terms of the loan agreement for a minimum of six months and the collection of principal and interest under the revised terms is deemed probable. All TDRs are considered to be impaired loans. The allowance for loan losses and related provision expense are susceptible to change if the credit quality of our loan portfolio changes, which is evidenced by many factors, including but not limited to charge-offs and non-performing loan trends. Generally, consumer real estate lending has a lower credit risk profile compared to other consumer lending (such as automobile loans). Commercial real estate and commercial and industrial lending, however, can have higher risk profiles than consumer loans due to these loans being larger in amount and non-homogeneous in structure and term. Changes in economic conditions, the mix and size of the loan portfolio, and individual borrower conditions can dramatically impact our level of allowance for loan losses in relatively short periods of time. The allowance for loan losses is maintained to cover incurred losses that are estimated in accordance with US GAAP. It is our estimate of credit losses inherent in our loan portfolio at each balance sheet date. Our methodology for analyzing the allowance for loan losses consists of general and specific components. For the general component, we stratify the loan portfolio into homogeneous groups of loans that possess similar loss potential characteristics and apply a loss ratio to these groups of loans to estimate the credit losses in the loan portfolio. We use both historical loss ratios and qualitative loss factors assigned to major loan collateral types to establish general component loss allocations, inclusive of estimated loss emergence periods. Qualitative loss factors are based on management's judgment of company, market, industry or business specific data and external economic indicators, which are not yet reflected in the historical loss ratios, and that could impact the Company's specific loan portfolios. The Allowance for Loan Loss Committee sets and adjusts qualitative loss factors by regularly reviewing changes in underlying loan composition and the seasonality of specific portfolios. The Allowance for Loan Loss Committee also considers credit quality and trends relating to delinquency, non-performing and adversely rated loans within the Company's loan portfolio when evaluating qualitative loss factors. Additionally, the Allowance for Loan Loss Committee adjusts qualitative factors to account for the potential impact of external economic factors, including the unemployment rate, vacancy and capitalization rates and other pertinent economic data specific to our primary market area and lending portfolios. For the specific component, the allowance for loan losses includes loans where management has concerns about the borrower's ability to repay and on individually analyzed loans found to be impaired. Management evaluates current information and events regarding a borrower's ability to repay its obligations and considers a loan to be impaired when the ultimate collectability of amounts due, according to the contractual terms of the loan agreement, is in doubt. If an impaired loan is collateral-dependent, the fair value of the collateral, less the estimated cost to sell, is used to determine the amount of impairment. If an impaired loan is not collateral-dependent, estimated discounted cash flows are used to determine the amount of impairment, if any. For impaired loans, the amount of the impairment can be adjusted, based on current data, until such time as the actual basis is established by acquisition of the collateral or until the basis is collected. Impairment losses are reflected in the allowance for loan losses through a charge to the provision for credit losses. Subsequent recoveries are credited to the allowance for loan losses. Cash receipts for accruing loans are applied to principal and interest under the contractual terms of the loan agreement. Cash receipts on impaired loans for which the accrual of interest has been discontinued are applied first to principal. Large groups of smaller-balance homogeneous loans are collectively evaluated for impairment. As a result, the Company does not separately identify consumer real estate loans less than $417 or individual consumer non-real estate secured loans for impairment disclosures. The Company considers these loans to be homogeneous in nature due to the smaller dollar amount and the similar underwriting criteria.
Loans	For loans collateralized by real property and commercial and industrial loans, credit exposure is monitored by internally assigned grades used for classification of loans. A loan is considered “special mention” when management has determined that there is a potential weakness that deserves management's close attention. Loans rated as "special mention" are not adversely classified according to regulatory classifications and do not expose the Company to sufficient risk to warrant adverse classification. A loan is considered “substandard” if it is inadequately protected by the current net worth and paying capacity of the obligor or the collateral pledged, if any. “Substandard” loans include those characterized by the “distinct possibility” that the insured institution will sustain “some loss” if the deficiencies are not corrected, and the loan may or may not meet the criteria for impairment. Loans classified as “doubtful” have all of the weaknesses of those classified as “substandard” with the added characteristic that the weaknesses present makes “collection or liquidation in full,” on the basis of currently existing facts, conditions and values, “highly questionable and improbable.” All other loans that do not fall into the above mentioned categories are considered “pass” loans. Updates to internally assigned grades are made monthly and/or upon significant developments. For other consumer loans (non-real estate), credit exposure is monitored by payment history of the loans. Non-performing other consumer loans are on nonaccrual status and are generally greater than 90 days past due. Past due status is based on the contractual terms of the loan. Loans that are past due 30 days are considered delinquent. Interest income on loans is discontinued at the time the loan is 90 days delinquent unless the loan is well-secured and in process of collection. Non-mortgage consumer loans are typically charged off no later than 120 days past due. In all cases, loans are placed on nonaccrual status or charged-off at an earlier date if collection of principal or interest is considered doubtful. Nonaccrual loans include both smaller balance homogeneous loans that are collectively evaluated for impairment and larger individually classified impaired loans. All interest accrued but not received for loans placed on nonaccrual status is reversed against interest income. Subsequent receipts on non-accrual loans are recorded as a reduction of principal, and interest income is recorded only after principal recovery is reasonably assured. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.
Fair Value	Impaired loans - Impaired loans that are collateral dependent are measured for impairment using the fair value of the collateral adjusted by additional Level 3 inputs, such as discounts of market value, estimated marketing costs and estimated legal expenses. Impaired loans secured by real estate, receivables or inventory had discounts determined by management on an individual loan basis. Impaired loans that are not collateral dependent are measured for impairment by a discounted cash flow analysis using a net present value calculation that utilizes data from the loan file before and after the modification. Foreclosed assets - These loans are measured at the lower of book or fair value less costs to sell using third party appraisals, listing agreements or sale contracts, which may be adjusted by additional Level 3 inputs, such as discounts of market value, estimated marketing costs and estimated legal expenses. Management may also consider additional adjustments on specific properties due to the age of the appraisal, expected holding period, lack of comparable sales, or if the other real estate owned is a special use property. At March 31, 2018 , the Company had $704 in residential mortgage loans in the process of foreclosure. The Credit Risk Management department evaluates the valuations on impaired loans and foreclosed assets at least quarterly. The valuations on impaired loans are reviewed at least quarterly by the Allowance for Loan Loss Committee and are considered in the calculation of the allowance for loan losses. Unobservable inputs, such as discounts to collateral, are monitored and adjusted if market conditions change. ASC 820, “Fair Value Measurements and Disclosures”, establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3: Prices or valuation techniques that require inputs that are both significant and unobservable in the market. These instruments are valued using the best information available, some of which is internally developed, and reflects a reporting entity’s own assumptions about the risk premiums that market participants would generally require and the assumptions they would use. The following methods and assumptions were used to estimate the fair values of each class of financial instrument presented: Cash and cash equivalents - Due to their short term nature, the carrying amount approximates the estimated fair value. Securities held to maturity - The fair values of these securities is determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities (Level 2 inputs). Loans held for investment (including Warehouse Purchase Program loans) - Pursuant to the adoption of ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities , for values reported for the 2018 period, fair value is based on cash flows, adjusted for credit and prepayments, discounted using current market yields. For values reported prior to 2018, fair value is based on cash flows, adjusted for prepayments, discounted using then- current market offering rates, including a credit spread. FHLB stock and other restricted securities - The fair value on these securities is their cost basis due to restrictions on transferability. Accrued interest receivable - Due to their short term nature, the carrying amount approximates the estimated fair value. Deposits - Fair value is calculated using the FHLB advance curve to discount cash flows based on the estimated life of the deposits. FHLB advances - Fair value is calculated using the FHLB advance curve to discount cash flows based on the contractual repayment schedule. Repurchase agreement - The fair value is based on discounting the estimated cash flows using the current rate at which similar borrowings would be made with similar terms and remaining maturities. Subordinated debt - The estimated fair value is based on current market rates on similar debt in the market. Accrued interest payable - Due to their short term nature, the carrying amount approximates the estimated fair value. The fair value of off-balance sheet items is based on the current fees or costs that would be charged to enter into or terminate such arrangements and are not considered significant to this presentation. The following methodologies were used to measure the fair value of financial assets and liabilities valued on a recurring basis: Securities available for sale - The fair values of securities available for sale are determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities (Level 2 inputs). Residential mortgage loans held for sale - Mortgage loans held for sale, which are sold on a servicing released basis, are valued using a market approach by utilizing either: (i) the fair value of securities backed by similar mortgage loans, adjusted for certain factors to approximate the fair value of a whole mortgage loan, including the value attributable to mortgage servicing and credit risk, (ii) current commitments to purchase loans or (iii) recent observable market trades for similar loans, adjusted to credit risk and other individual loan characteristics. As these prices are derived from market observable inputs, the Company classifies these valuations as Level 2 in the fair value disclosures. Interest income on mortgage loans held for sale is recognized based on the contractual rates and reflected in interest income on loans held for sale in the consolidated income statement. The Company has no continuing involvement in any residential mortgage loans sold. Derivative instruments: Interest rate lock commitments ("IRLCs") - The estimated fair values of IRLCs utilize current secondary market prices for underlying loans and estimated servicing value with similar coupons, maturity and credit quality, subject to the anticipated loan funding probability (Pull-through rate). The fair value of IRLCs is subject to change primarily due to changes in interest rates and the estimated Pull-through rate. These commitments are classified as Level 2 in the fair value disclosures, as the valuations are based on observable market inputs. Forward mortgage-backed securities trades - These forward mortgage-backed securities trades are exchange-traded or traded within highly active dealer markets. In order to determine the fair value of these instruments, the Company utilized the exchange price or dealer market price for the particular derivative contract; therefore these contracts are classified as Level 2. The estimated fair values are subject to change primarily due to changes in interest rates. Loan customer counterparty and financial institution counterparty - The Company also enters into certain interest rate derivative positions that are not designated as hedging instruments. The estimated fair value of these commercial loan interest rate swaps are obtained from a pricing service that provides the swaps' unwind value (Level 2 inputs). Please see Note 7 - Derivative Financial Instruments for more information.
Derivatives	These financial instruments are not designated as hedging instruments and are used for asset and liability management and commercial customers' financing needs. All derivatives are carried at fair value in either other assets or other liabilities. IRLCs - In the normal course of business, the Company enters into IRLCs with consumers to originate mortgage loans at a specified interest rate. These commitments, which contain fixed expiration dates, offer the borrower an interest rate guarantee provided the loan meets underwriting guidelines and closes within the timeframe established by the Company. Forward mortgage-backed securities trades - The Company manages the changes in fair value associated with changes in interest rates related to IRLCs by using forward sold commitments known as forward mortgage-backed securities trades. These instruments are typically entered into at the time the IRLC is made. Interest rate swaps and caps - These derivative positions relate to transactions in which we enter into an interest rate swap or cap with a customer, while at the same time entering into an offsetting interest rate swap or cap with another financial institution. An interest rate swap transaction allows our customer to effectively convert a variable rate loan to a fixed rate. In connection with each swap, we agree to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on a similar notional amount at a fixed interest rate. At the same time, we agree to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. In connection with each interest rate cap, we sell a cap to the customer and agree to pay interest if the underlying index exceeds the strike price defined in the cap agreement. Simultaneously we purchase a cap with matching terms from another financial institution which agrees to pay us if the underlying index exceeds the strike price.
Effect of Newly Issued But Not Yet Effective Accounting Standards	Effect of Newly Issued But Not Yet Effective Accounting Standards In February 2016, the FASB issued ASU 2016-02, Leases . This ASU requires lessees to put most leases on their balance sheets but recognize expenses in the income statement in a manner similar to current accounting treatment. This ASU changes the guidance on sale-leaseback transactions, initial direct costs and lease execution costs, and, for lessors, modifies the classification criteria and the accounting for sales-type and direct financing leases. For public business entities, this ASU is effective for annual periods beginning after December 15, 2018, and interim periods therein. Entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. The Company is evaluating the impact of this ASU on its financial statements and disclosures. In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments. This ASU removes the thresholds that companies apply to measure credit losses on financial instruments measured at amortized cost, such as loans, receivables, and held-to-maturity debt securities. Under current US GAAP, companies generally recognize credit losses when it is probable that the loss has been incurred. This revised guidance will remove all recognition thresholds and will require companies to recognize an allowance for lifetime expected credit losses. Credit losses will be immediately recognized through net income; the amount recognized will be based on the current estimate of contractual cash flows not expected to be collected over the financial asset’s contractual term. ASU 2016-13 also amends the credit loss measurement guidance for available for sale debt securities. For public business entities, this ASU is effective for financial statements issued for fiscal years and for interim periods within those fiscal years beginning after December 15, 2019. The Company is evaluating the impact of this ASU on its financial statements and disclosures. In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities. This ASU amends the hedge accounting model to enable entities to better portray their risk management activities in their financial statements, by expanding an entity's ability to hedge nonfinancial and financial risk components and reduce complexity in fair value hedges of interest rate risk. This ASU eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. Additionally, this ASU also eases certain documentation and assessment requirements and modifies the accounting for components excluded from the assessment of hedge effectiveness. For public business entities, this ASU is effective for financial statements issued for fiscal years and for interim periods within those fiscal years beginning after December 15, 2018. The Company is evaluating the impact of this ASU on its financial statements and disclosures. In February 2018, the FASB issued ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. For public business entities, this ASU is effective for financial statements issued for fiscal years and for interim periods within those fiscal years beginning after December 15, 2018. Early adoption of the amendments in this ASU is permitted, including adoption in any interim period, (1) for public business entities for reporting periods for which financial statements have not yet been issued and (2) for all other entities for reporting periods for which financial statements have not yet been made available for issuance. The amendments in this ASU should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Cuts and Jobs Act is recognized. The Company elected early adoption of this ASU for the quarter ended March 31, 2018. Please see Note 9 - Income Taxes for more information about the adoption of this ASU.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Significant Revenue Streams from Contracts with Customers	Significant revenue streams recognized by the Company from contracts with customers accounted for under ASC 606 for the three months ended March 31, 2018 and March 31, 2017 , are below: Three Months Ended March 31, 2018 2017 Card services income (a) $ 3,058 $ 2,842 Service charges on deposits (b) 1,773 1,838 Title income (c) 1,057 1,434 Gains (losses) on the sale of other real estate owned (d) (40 ) 45

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Reconciliation of Numerator and Denominator of Basic and Diluted Earnings per Common Share	A reconciliation of the numerator and denominator of the basic and diluted earnings per common share computation for the three months ended March 31, 2018 and 2017 is as follows: Three Months Ended March 31, 2018 2017 Basic earnings per share: Numerator: Net income $ 25,762 $ 18,190 Distributed and undistributed earnings to participating securities (75 ) (79 ) Income available to common shareholders $ 25,687 $ 18,111 Denominator: Weighted average common shares outstanding 48,197,596 47,897,062 Less: Average unallocated ESOP shares (1,187,533 ) (1,240,486 ) Average unvested restricted stock awards (137,730 ) (202,918 ) Average shares for basic earnings per share 46,872,333 46,453,658 Basic earnings per common share $ 0.55 $ 0.39 Diluted earnings per share: Numerator: Income available to common shareholders $ 25,687 $ 18,111 Denominator: Average shares for basic earnings per share 46,872,333 46,453,658 Dilutive effect of share-based compensation plan 692,254 606,648 Average shares for diluted earnings per share 47,564,587 47,060,306 Diluted earnings per common share $ 0.54 $ 0.38 Share awards excluded in the computation of diluted earnings per share because the exercise price was greater than the common stock average market price and were therefore antidilutive 184,000 129,008

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Related Gross Unrealized Gains and Losses, and Fair Value of Securities Available for Sale	The amortized cost, related gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) and the fair value of securities available for sale ("AFS") were as follows: March 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Agency residential mortgage-backed securities 1 $ 181,361 $ 350 $ 4,407 $ 177,304 Agency commercial mortgage-backed securities 1 9,344 — 211 9,133 Agency residential collateralized mortgage obligations 1 216,747 34 5,449 211,332 US government and agency securities 1,500 46 — 1,546 Municipal bonds 32,460 45 407 32,098 Total securities $ 441,412 $ 475 $ 10,474 $ 431,413 December 31, 2017 Agency residential mortgage-backed securities 1 $ 191,216 $ 419 $ 2,169 $ 189,466 Agency commercial mortgage-backed securities 1 9,360 — 125 9,235 Agency residential collateralized mortgage obligations 1 187,637 4 3,425 184,216 US government and agency securities 1,590 81 — 1,671 Municipal bonds 35,196 241 308 35,129 Total securities $ 424,999 $ 745 $ 6,027 $ 419,717 1 Mortgage-backed securities and collateralized mortgage obligations are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
Amortized Cost, Related Gross Unrealized Gains and Losses, and Fair Value of Securities Held to Maturity	The amortized cost (carrying amount), unrealized gains and losses and fair value of securities held to maturity ("HTM") were as follows: March 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Agency residential mortgage-backed securities 1 $ 53,674 $ 421 $ 1,246 $ 52,849 Agency commercial mortgage-backed securities 1 20,681 42 248 20,475 Agency residential collateralized mortgage obligations 1 24,630 159 141 24,648 Municipal bonds 57,913 772 623 58,062 Total securities $ 156,898 $ 1,394 $ 2,258 $ 156,034 December 31, 2017 Agency residential mortgage-backed securities 1 $ 57,334 $ 616 $ 646 $ 57,304 Agency commercial mortgage-backed securities 1 27,435 589 98 27,926 Agency residential collateralized mortgage obligations 1 27,112 265 99 27,278 Municipal bonds 61,628 1,079 289 62,418 Total securities $ 173,509 $ 2,549 $ 1,132 $ 174,926 1 Mortgage-backed securities and collateralized mortgage obligations are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
Amortized Cost and Fair Value of Held to Maturity Debt Securities and Fair Value of Available-for-Sale Debt Securities	The amortized cost (carrying amount) and fair value of held to maturity debt securities and the fair value of available for sale debt securities at March 31, 2018 by contractual maturity are set forth in the table below. Securities with contractual payments not due at a single maturity date, including mortgage-backed securities and collateralized mortgage obligations, are shown separately. HTM AFS Amortized Cost Fair Value Fair Value Due in one year or less $ 460 $ 463 $ 2,845 Due after one to five years 12,555 12,783 11,209 Due after five to ten years 42,803 42,779 15,770 Due after ten years 2,095 2,037 3,820 Agency residential mortgage-backed securities 53,674 52,849 177,304 Agency commercial mortgage-backed securities 20,681 20,475 9,133 Agency residential collateralized mortgage obligations 24,630 24,648 211,332 Total $ 156,898 $ 156,034 $ 431,413
Securities with Unrealized Losses	Securities with unrealized losses at March 31, 2018 and December 31, 2017 , aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows: AFS Less than 12 Months 12 Months or More Total March 31, 2018 Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Agency residential mortgage-backed securities 1 $ 58,594 $ 1,326 $ 91,249 $ 3,081 $ 149,843 $ 4,407 Agency commercial mortgage-backed securities 1 9,134 211 — — 9,134 211 Agency residential collateralized mortgage obligations 1 141,955 3,235 52,868 2,214 194,823 5,449 Municipal bonds 18,694 284 3,719 123 22,413 407 Total temporarily impaired $ 228,377 $ 5,056 $ 147,836 $ 5,418 $ 376,213 $ 10,474 December 31, 2017 Agency residential mortgage-backed securities 1 $ 59,545 $ 412 $ 100,214 $ 1,757 $ 159,759 $ 2,169 Agency commercial mortgage-backed securities 1 9,235 125 — — 9,235 125 Agency residential collateralized mortgage obligations 1 128,869 1,860 49,171 1,565 178,040 3,425 Municipal bonds 10,114 72 6,583 236 16,697 308 Total temporarily impaired $ 207,763 $ 2,469 $ 155,968 $ 3,558 $ 363,731 $ 6,027 HTM Less than 12 Months 12 Months or More Total March 31, 2018 Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Agency residential mortgage-backed securities 1 $ 19,773 $ 530 $ 15,838 $ 716 $ 35,611 $ 1,246 Agency commercial mortgage-backed securities 1 15,222 121 3,405 127 18,627 248 Agency residential collateralized mortgage obligations 1 9,274 106 2,003 35 11,277 141 Municipal bonds 11,469 243 10,296 380 21,765 623 Total temporarily impaired $ 55,738 $ 1,000 $ 31,542 $ 1,258 $ 87,280 $ 2,258 December 31, 2017 Agency residential mortgage-backed securities 1 $ 20,397 $ 206 $ 16,909 $ 440 $ 37,306 $ 646 Agency commercial mortgage-backed securities 1 3,685 26 3,484 72 7,169 98 Agency residential collateralized mortgage obligations 1 8,008 64 2,267 35 10,275 99 Municipal bonds 9,313 80 10,486 209 19,799 289 Total temporarily impaired $ 41,403 $ 376 $ 33,146 $ 756 $ 74,549 $ 1,132 1 Mortgage-backed securities and collateralized mortgage obligations are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Loans	Loans consist of the following. All periods presented in this note include a reclassification of three Warehouse relationships from the commercial and industrial category to the Warehouse Purchase Program category. At March 31, 2018 and December 31, 2017 , these reclassified relationships totaled $144,270 and $166,258 , respectively. March 31, December 31, 2017 Loans held for sale, at fair value $ 31,123 $ 16,707 Loans held for investment: Commercial real estate $ 3,053,750 $ 3,019,339 Commercial and industrial 1,967,443 1,927,049 Construction and land 252,213 277,864 Consumer real estate 1,252,433 1,213,434 Other consumer 43,284 45,506 Gross loans held for investment, excluding Warehouse Purchase Program 6,569,123 6,483,192 Net of: Deferred costs (fees) and discounts, net 7,630 6,380 Allowance for loan losses (74,508 ) (71,301 ) Net loans held for investment, excluding Warehouse Purchase Program 6,502,245 6,418,271 Warehouse Purchase Program 1,019,840 1,320,846 Total loans held for investment $ 7,522,085 $ 7,739,117
Allowances for Loan Losses and Off-Balance Sheet Credit Losses	Changes in the allowance for off-balance sheet credit losses on lending-related commitments and guarantees on credit card debt, included in "accrued expenses and other liabilities" on the consolidated balance sheets, are summarized in the following table. Please see Note 10 - Commitments and Contingent Liabilities for more information. Three Months Ended March 31, 2018 2017 Beginning Balance $ 929 $ 1,573 Charge-offs on lending-related commitments — — Provision (benefit) for credit losses on lending-related commitments 28 (399 ) Ending Balance $ 957 $ 1,174 Activity in the allowance for loan losses for the three months ended March 31, 2018 and 2017 , segregated by portfolio segment and evaluation for impairment, is set forth below. The below activity does not include Warehouse Purchase Program loans, which are collectively evaluated for impairment and are purchased under several contractual requirements, providing safeguards to the Company. To date, the Company has not experienced a loss on its Warehouse Purchase Program loans and no allowance for loan losses has been allocated to them. At March 31, 2018 and 2017 , the allowance for loan impairment related to purchased credit impaired ("PCI") loans totaled $314 and $225 , respectively. For the three months ended March 31, 2018 Commercial Real Estate Commercial and Industrial Construction and Land Consumer Real Estate Other Consumer Total Allowance for loan losses: Beginning balance $ 21,587 $ 39,005 $ 4,644 $ 4,838 $ 1,227 $ 71,301 Charge-offs (3 ) (12,236 ) — — (288 ) (12,527 ) Recoveries — 22 — 11 66 99 Provision expense (benefit) (46 ) 15,973 (706 ) 180 234 15,635 Ending balance $ 21,538 $ 42,764 $ 3,938 $ 5,029 $ 1,239 $ 74,508 Allowance ending balance: Individually evaluated for impairment $ 56 $ 11,250 $ — $ 226 $ 30 $ 11,562 Collectively evaluated for impairment 21,482 31,514 3,938 4,803 1,209 62,946 Loans: Individually evaluated for impairment 3,748 40,453 — 2,911 23 47,135 Collectively evaluated for impairment 3,047,695 1,926,847 252,213 1,248,769 43,080 6,518,604 PCI loans 2,307 143 — 753 181 3,384 Ending balance $ 3,053,750 $ 1,967,443 $ 252,213 $ 1,252,433 $ 43,284 $ 6,569,123 For the three months ended March 31, 2017 Commercial Real Estate Commercial and Industrial Construction and Land Consumer Real Estate Other Consumer Total Allowance for loan losses: Beginning balance $ 18,303 $ 35,464 $ 5,075 $ 4,484 $ 1,250 $ 64,576 Charge-offs (16 ) (16,530 ) (418 ) (35 ) (247 ) (17,246 ) Recoveries 205 40 — 12 369 626 Provision expense (benefit) 866 21,912 (98 ) (76 ) 96 22,700 Ending balance $ 19,358 $ 40,886 $ 4,559 $ 4,385 $ 1,468 $ 70,656 Allowance ending balance: Individually evaluated for impairment $ 37 $ 9,337 $ — $ 180 $ 371 $ 9,925 Collectively evaluated for impairment 19,321 31,549 4,559 4,205 1,097 60,731 Loans: Individually evaluated for impairment 4,336 94,494 310 2,783 973 102,896 Collectively evaluated for impairment 2,776,564 1,735,969 289,948 1,105,793 49,520 5,957,794 PCI loans 5,577 208 — 883 229 6,897 Ending balance $ 2,786,477 $ 1,830,671 $ 290,258 $ 1,109,459 $ 50,722 $ 6,067,587
Impaired Loans	The carrying amount of PCI loans included in the consolidated balance sheets and the related outstanding balances at March 31, 2018 and December 31, 2017 are set forth in the table below. The outstanding balance represents the total amount owed, including accrued but unpaid interest, and any amounts previously charged off. March 31, 2018 December 31, 2017 Carrying amount 1 $ 3,070 $ 3,295 Outstanding balance 3,804 3,992 1 The carrying amounts are reported net of allowance for loan losses of $314 and $269 as of March 31, 2018 and December 31, 2017 . Changes in the accretable yield for PCI loans for the three months ended March 31, 2018 and 2017 are as follows: Three Months Ended March 31, 2018 2017 Beginning balance $ 2,279 $ 2,515 Reclassifications (to) from nonaccretable 51 198 Disposals (64 ) — Accretion (99 ) (186 ) Balance at end of period $ 2,167 $ 2,527 Impaired loans at March 31, 2018 and December 31, 2017 , were as follows 1 : March 31, 2018 Unpaid Recorded Recorded Total Recorded Investment Related Commercial real estate $ 4,069 $ 3,748 $ — $ 3,748 $ — Commercial and industrial 42,309 17,111 23,342 40,453 11,234 Consumer real estate 3,472 2,905 6 2,911 6 Other consumer 61 11 12 23 8 Total $ 49,911 $ 23,775 $ 23,360 $ 47,135 $ 11,248 December 31, 2017 Commercial real estate $ 4,411 $ 4,134 $ — $ 4,134 $ — Commercial and industrial 89,713 48,463 35,542 84,005 10,502 Consumer real estate 3,545 2,985 7 2,992 7 Other consumer 71 16 19 35 13 Total $ 97,740 $ 55,598 $ 35,568 $ 91,166 $ 10,522 1 No Warehouse Purchase Program loans were impaired at March 31, 2018 or December 31, 2017 . Loans reported do not include PCI loans. Income on impaired loans for the three months ended March 31, 2018 and 2017 , was as follows 1 : Three Months Ended March 31, 2018 2017 Average Interest Average Interest Commercial real estate $ 3,879 $ 2 $ 4,966 $ 2 Commercial and industrial 63,294 — 88,076 — Construction and land — — 7,388 — Consumer real estate 2,952 8 3,042 3 Other consumer 29 1 297 1 Total $ 70,154 $ 11 $ 103,769 $ 6 1 Loans reported do not include PCI loans.
Non-Performing (Nonaccrual) Loans	Non-performing (nonaccrual) loans were as follows: March 31, 2018 December 31, 2017 Commercial real estate $ 3,748 $ 4,134 Commercial and industrial 40,455 84,003 Consumer real estate 5,548 6,190 Other consumer 85 76 Total $ 49,836 $ 94,403
Outstanding and Recorded Balances of Loans Modified as TDRs	The outstanding balances of TDRs are shown below: March 31, 2018 December 31, 2017 Nonaccrual TDRs (1) $ 17,117 $ 17,294 Performing TDRs (2) 732 768 Total $ 17,849 $ 18,062 Outstanding commitments to lend additional funds to borrowers with TDR loans — — 1 Nonaccrual TDR loans are included in the nonaccrual loan totals. 2 Performing TDR loans are loans that have been performing under the restructured terms for at least six months and the Company is accruing interest on these loans. The following tables provide the recorded balances of loans modified as a TDR during the three months ended March 31, 2018 and 2017 . For the three months ended March 31, 2018 Principal Deferrals Other Total Commercial and industrial $ 83 $ — $ 83 Total $ 83 $ — $ 83 For the three months ended March 31, 2017 Principal Deferrals Other Total Commercial and industrial $ — $ 14,592 (1) $ 14,592 Total $ — $ 14,592 $ 14,592 1 Reserve-based energy relationships where the primary modifications consisted of suspension of required borrowing base payments.
Analysis of Age of Recorded Investment in Loans	Below is an analysis of the age of recorded investment in loans that were past due at March 31, 2018 and December 31, 2017 . No Warehouse Purchase Program loans were delinquent at March 31, 2018 or December 31, 2017 and therefore are not included in the following tables. March 31, 2018 30-59 Days Past Due 60-89 Days Past Due 90 Days and Greater Past Due Total Loans Past Due Current Loans 1 Total Loans Commercial real estate $ 40,817 $ — $ — $ 40,817 $ 3,012,933 $ 3,053,750 Commercial and industrial 2,891 122 1,340 4,353 1,963,090 1,967,443 Construction and land 891 — — 891 251,322 252,213 Consumer real estate 16,097 196 741 17,034 1,235,399 1,252,433 Other consumer 341 52 — 393 42,891 43,284 Total $ 61,037 $ 370 $ 2,081 $ 63,488 $ 6,505,635 $ 6,569,123 December 31, 2017 Commercial real estate $ 9,414 $ — $ 250 $ 9,664 $ 3,009,675 $ 3,019,339 Commercial and industrial 918 284 7,350 8,552 1,918,497 1,927,049 Construction and land 9,354 — — 9,354 268,510 277,864 Consumer real estate 16,436 2,928 1,367 20,731 1,192,703 1,213,434 Other consumer 891 34 2 927 44,579 45,506 Total $ 37,013 $ 3,246 $ 8,969 $ 49,228 $ 6,433,964 $ 6,483,192 1 Includes acquired PCI loans with a total carrying value of $3,371 and $3,338 at March 31, 2018 and December 31, 2017 , respectively.
Real Estate and Commercial and Industrial Credit Risk Profile by Internally Assigned Grade	The recorded investment in loans by credit quality indicators at March 31, 2018 and December 31, 2017 , was as follows: Real Estate and Commercial and Industrial Credit Exposure Credit Risk Profile by Internally Assigned Grade March 31, 2018 Commercial Real Estate Commercial and Industrial Construction and Land Consumer Real Estate Grade: 1 Pass $ 3,026,208 $ 1,848,915 $ 252,213 $ 1,243,095 Special Mention 19,929 38,292 — 1,376 Substandard 7,613 80,196 — 7,196 Doubtful — 40 — 766 Total $ 3,053,750 $ 1,967,443 $ 252,213 $ 1,252,433 December 31, 2017 Grade: 1 Pass $ 2,980,656 $ 1,787,238 $ 277,864 $ 1,203,236 Special Mention 30,656 43,161 — 1,408 Substandard 8,027 96,546 — 7,762 Doubtful — 104 — 1,028 Total $ 3,019,339 $ 1,927,049 $ 277,864 $ 1,213,434 1 PCI loans are included in the substandard or doubtful categories. These categories are consistent with the "substandard" and "doubtful" categories as defined by regulatory authorities.
Consumer Credit Exposure Credit Risk Profile Based on Payment Activity	Other Consumer Credit Exposure Credit Risk Profile Based on Payment Activity March 31, 2018 December 31, 2017 Performing $ 43,199 $ 45,430 Non-performing 85 76 Total $ 43,284 $ 45,506

Fair Value (Tables)

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on a Recurring Basis	Assets and liabilities measured at fair value on a recurring basis are summarized below. Fair Value Measurements Using Level 2 March 31, 2018 December 31, 2017 Assets: Agency residential mortgage-backed securities $ 177,304 $ 189,466 Agency commercial mortgage-backed securities 9,133 9,235 Agency residential collateralized mortgage obligations 211,332 184,216 US government and agency securities 1,546 1,671 Municipal bonds 32,098 35,129 Total securities available for sale $ 431,413 $ 419,717 Loans held for sale 1 $ 31,123 $ 16,707 Derivative financial instruments: Interest rate lock commitments 445 358 Forward mortgage-backed securities trades — 7 Loan customer counterparty — — Financial institution counterparty 2,576 1,735 Liabilities: Derivative financial instruments: Interest rate lock commitments — — Forward mortgage-backed securities trades 118 18 Loan customer counterparty 2,576 1,735 Financial institution counterparty — — 1 At March 31, 2018 and December 31, 2017 , loans held for sale had an aggregate outstanding principal balance of $30,304 and $16,242 , respectively. There were no mortgage loans held for sale that were 90 days or greater past due or on non-accrual at March 31, 2018 or December 31, 2017 .
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis	Assets measured at fair value on a non-recurring basis are summarized below. There were no liabilities measured at fair value on a non-recurring basis at March 31, 2018 or December 31, 2017 . Fair Value Measurements Using Level 3 March 31, 2018 December 31, 2017 Assets: Impaired loans $ 12,112 $ 25,046 Foreclosed assets: Commercial real estate 6,694 6,694 Construction and land 800 859 Consumer real estate — 192 Other 666 687
Carrying Amount and Fair Value of Financial Instruments Not Recorded at Fair Value	The carrying amount and fair value information of financial instruments not recorded at fair value in their entirety on a recurring basis on the Company's consolidated balance sheets at March 31, 2018 and at December 31, 2017 , were as follows: Fair Value Measurement Using March 31, 2018 Carrying Amount Level 1 Level 2 Level 3 Financial assets Cash and cash equivalents $ 294,904 $ 294,904 $ — $ — Securities held to maturity 156,898 — 156,034 — Loans held for investment, net 6,502,245 — — 6,486,126 Loans held for investment - Warehouse Purchase Program 1,019,840 — — 1,019,778 FHLB and other restricted securities, at cost 46,842 — 46,842 — Accrued interest receivable 24,322 24,322 — — Financial liabilities Deposits $ 6,954,407 $ — $ — $ 6,407,215 FHLB advances 604,562 — — 604,758 Repurchase agreements 76,610 — — 72,920 Subordinated debt 134,645 — — 142,531 Accrued interest payable 4,608 4,608 — — December 31, 2017 Financial assets Cash and cash equivalents $ 293,456 $ 293,456 $ — $ — Securities held to maturity 173,509 — 174,926 — Loans held for investment, net 6,418,271 — — 6,484,949 Loans held for investment - Warehouse Purchase Program 1,320,846 — — 1,337,612 FHLB and other restricted securities, at cost 64,790 — 64,790 — Accrued interest receivable 24,596 24,596 — — Financial liabilities Deposits $ 6,767,683 $ — $ — $ 6,326,572 FHLB advances 1,043,163 — — 1,043,416 Repurchase agreement 84,676 — — 81,041 Subordinated debt 134,522 — — 141,972 Accrued interest payable 2,729 2,729 — —

Derivative Financial Instrume27

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional Balances and Fair Values of Outstanding Positions	The following table provides the outstanding notional balances and fair values of outstanding derivative positions at March 31, 2018 and December 31, 2017 . March 31, 2018 December 31, 2017 Outstanding Notional Balance Asset Derivative Fair Value Liability Derivative Fair Value Outstanding Notional Balance Asset Derivative Fair Value Liability Derivative Fair Value IRLCs $ 13,460 $ 445 $ — $ 10,337 $ 358 $ — Forward mortgage-backed securities trades 32,133 — 118 19,788 7 18 Commercial loan interest rate swaps and caps: Loan customer counterparty $ 113,904 $ — $ 2,576 $ 114,594 $ — $ 1,735 Financial institution counterparty 113,904 2,576 — 114,594 1,735 —
Weighted Average Received and Paid and Income (Loss) on Derivatives Not Designated as Hedging Instruments	Income (loss) for the three months ended March 31, 2018 and 2017 was as follows: Derivatives not designated as hedging instruments Three Months Ended March 31, 2018 2017 IRLCs $ 87 $ 172 Forward mortgage-backed securities trades 399 (112 ) The commercial loan customer counterparty weighted average received and paid interest rates for interest rate swaps outstanding at March 31, 2018 and December 31, 2017 are presented in the following table. Weighted-Average Interest Rate March 31, 2018 December 31, 2017 Received Paid Received Paid Loan customer counterparty 2.51 % 2.86 % 2.52 % 2.54 %

Share-based Compensation (Table

Share-based Compensation (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation Cost Charged to Income for Share-based Compensation	Compensation cost charged to income for share-based compensation is presented below. Three Months Ended March 31, 2018 2017 Restricted stock $ 1,064 $ 868 Stock options 991 694 Income tax benefit 432 547
Summary of Nonvested Share Activity in Restricted Stock	A summary of non-vested share activity in the restricted stock portion of the Company's share-based compensation plans ("Plans") for the three months ended March 31, 2018 is presented below. Time-Vested Shares Performance-Based Shares Shares Weighted-Average Grant Date Fair Value per Share 1 Shares Weighted-Average Grant Date Fair Value per Share 2 Beginning balance 128,588 $ 27.27 73,008 $ 42.21 Granted 35,650 42.40 26,550 3 42.82 Vested (48,600 ) 21.27 (20,600 ) 44.04 Ending balance 115,638 $ 34.45 78,958 $ 42.82 1 For restricted stock awards with time-based vesting conditions, the grant date fair value is based upon the closing stock price as quoted on the Nasdaq Stock Market on the grant date. 2 For restricted stock awards with performance-based vesting conditions, the value of the award is based upon the closing stock price as quoted on the Nasdaq Stock Market on the date of vesting. Until the final value is determined on the vesting date, the Company estimates the fair value based upon the closing stock price as quoted on the Nasdaq Stock Market near the last business day of each month. 3 The 26,550 performance-based shares granted are represented in the table at target; however, if certain performance metrics are met at vesting, the shares may be awarded at up to 200% of their target amount, with an additional 20% increase or decrease in the total share award at vesting depending on the Company's Total Shareholder Return percentage for the determined period.
Summary of Activity in Stock Options	A summary of activity in the stock option portion of the Company's Plans for the three months ended March 31, 2018 is presented below. Shares Weighted- Average Exercise Price per Share Weighted- Average Remaining Contractual Term Aggregate Intrinsic Value Beginning Balance 2,207,243 $ 26.88 10.1 $ 33,848 Exercised (111,926 ) 23.77 Forfeited (32,375 ) 31.41 Ending Balance 2,062,942 26.97 9.9 32,693 Fully vested and expected to vest 2,055,462 26.95 9.9 32,619 Exercisable at March 31, 2018 989,931 $ 22.41 7.1 $ 20,205

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Summary of Net Deferred Tax Assets	A summary of the net deferred tax assets as of March 31, 2018 and December 31, 2017 , is presented below: March 31, 2018 December 31, 2017 Net deferred tax assets $ 21,689 $ 20,240 Estimated annual effective tax rate 21 %

Commitments and Contingent Li30

Commitments and Contingent Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Contractual Amounts of Financial Instruments with Off-Balance Sheet Risk	The contractual amounts of financial instruments with off‑balance sheet risk at March 31, 2018 and December 31, 2017 , are summarized below. Please see Part I-Item 2-"Off-Balance Sheet Arrangements, Contractual Obligations and Commitments" of this Form 10-Q for information related to commitment maturities. March 31, 2018 December 31, 2017 Unused commitments to extend credit $ 1,740,403 $ 1,600,794 Unused capacity on Warehouse Purchase Program loans 1,057,160 738,412 Standby letters of credit 33,403 34,091 Total unused commitments/capacity $ 2,830,966 $ 2,373,297

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Card services income
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 3,058	$ 2,842
Service charges on deposits
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,773	1,838
Title income
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,057	1,434
Gains (losses) on the sale of other real estate owned
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ (40)	$ 45

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income	$ 25,762	$ 18,190
Distributed and undistributed earnings to participating securities	(75)	(79)
Income available to common shareholders	$ 25,687	$ 18,111
Denominator:
Weighted average common shares outstanding (in shares)	48,197,596	47,897,062
Less: Average unallocated ESOP shares (in shares)	(1,187,533)	(1,240,486)
Average unvested restricted stock awards (in shares)	(137,730)	(202,918)
Average shares for basic earnings per share (in shares)	46,872,333	46,453,658
Basic earnings per common share (in dollars per share)	$ 0.55	$ 0.39
Numerator:
Income available to common shareholders	$ 25,687	$ 18,111
Denominator:
Average shares for basic earnings per share (in shares)	46,872,333	46,453,658
Dilutive effect of share-based compensation plan (in shares)	692,254	606,648
Average shares for diluted earnings per share (in shares)	47,564,587	47,060,306
Diluted earnings per common share (in dollars per share)	$ 0.54	$ 0.38
Share awards excluded in the computation of diluted earnings per share because the exercise price was greater than the common stock average market price and were therefore antidilutive (in shares)	184,000	129,008

Securities - Amortized Cost, Re

Securities - Amortized Cost, Related Gross Unrealized Gains and Losses, and Fair Value of Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 441,412	$ 424,999
Gross Unrealized Gains	475	745
Gross Unrealized Losses	10,474	6,027
Fair Value	431,413	419,717
Agency residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	181,361	191,216
Gross Unrealized Gains	350	419
Gross Unrealized Losses	4,407	2,169
Fair Value	177,304	189,466
Agency commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,344	9,360
Gross Unrealized Gains	0	0
Gross Unrealized Losses	211	125
Fair Value	9,133	9,235
Agency residential collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	216,747	187,637
Gross Unrealized Gains	34	4
Gross Unrealized Losses	5,449	3,425
Fair Value	211,332	184,216
US government and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,500	1,590
Gross Unrealized Gains	46	81
Gross Unrealized Losses	0	0
Fair Value	1,546	1,671
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	32,460	35,196
Gross Unrealized Gains	45	241
Gross Unrealized Losses	407	308
Fair Value	$ 32,098	$ 35,129

Securities - Amortized Cost, 34

Securities - Amortized Cost, Related Gross Unrealized Gains and Losses, and Fair Value of Securities Held-to-Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 156,898	$ 173,509
Gross Unrealized Gains	1,394	2,549
Gross Unrealized Losses	2,258	1,132
Fair Value	156,034	174,926
Agency residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	53,674	57,334
Gross Unrealized Gains	421	616
Gross Unrealized Losses	1,246	646
Fair Value	52,849	57,304
Agency commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	20,681	27,435
Gross Unrealized Gains	42	589
Gross Unrealized Losses	248	98
Fair Value	20,475	27,926
Agency residential collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	24,630	27,112
Gross Unrealized Gains	159	265
Gross Unrealized Losses	141	99
Fair Value	24,648	27,278
Municipal bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	57,913	61,628
Gross Unrealized Gains	772	1,079
Gross Unrealized Losses	623	289
Fair Value	$ 58,062	$ 62,418

Securities - Carrying Amount an

Securities - Carrying Amount and Fair Value of Held to Maturity Debt Securities and Fair Value of Available-for-Sale Debt Securities (Details) $ in Thousands	Mar. 31, 2018USD ($)
HTM - Amortized Cost
Due in one year or less	$ 460
Due after one to five years	12,555
Due after five to ten years	42,803
Due after ten years	2,095
Held-to-maturity securities, amortized cost	156,898
HTM - Fair Value
Due in one year or less	463
Due after one to five years	12,783
Due after five to ten years	42,779
Due after ten years	2,037
Held-to-maturity securities, fair value	156,034
AFS - Fair Value
Due in one year or less	2,845
Due after one to five years	11,209
Due after five to ten years	15,770
Due after ten years	3,820
Available-for-sale securities, fair value	431,413
Agency residential mortgage-backed securities
HTM - Amortized Cost
Held-to-maturity securities, amortized cost	53,674
HTM - Fair Value
Held-to-maturity securities, fair value	52,849
AFS - Fair Value
Available-for-sale securities, fair value	177,304
Agency commercial mortgage-backed securities
HTM - Amortized Cost
Held-to-maturity securities, amortized cost	20,681
HTM - Fair Value
Held-to-maturity securities, fair value	20,475
AFS - Fair Value
Available-for-sale securities, fair value	9,133
Agency residential collateralized mortgage obligations
HTM - Amortized Cost
Held-to-maturity securities, amortized cost	24,630
HTM - Fair Value
Held-to-maturity securities, fair value	24,648
AFS - Fair Value
Available-for-sale securities, fair value	$ 211,332

Securities - Narrative (Details

Securities - Narrative (Details) $ in Thousands	Mar. 31, 2018USD ($)security	Dec. 31, 2017USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Number of securities in unrealized losses	298
Number of securities in unrealized losses for greater than one year	117
Pledged as Collateral
Schedule of Held-to-maturity Securities [Line Items]
Carrying value of securities pledged as collateral | $	$ 245,494	$ 256,451

Securities - Available-for-Sale

Securities - Available-for-Sale Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
AFS - Fair Value
Less than 12 Months	$ 228,377	$ 207,763
12 Months or More	147,836	155,968
Total	376,213	363,731
AFS - Unrealized Loss
Less than 12 Months	5,056	2,469
12 Months or More	5,418	3,558
Total	10,474	6,027
Agency residential mortgage-backed securities
AFS - Fair Value
Less than 12 Months	58,594	59,545
12 Months or More	91,249	100,214
Total	149,843	159,759
AFS - Unrealized Loss
Less than 12 Months	1,326	412
12 Months or More	3,081	1,757
Total	4,407	2,169
Agency commercial mortgage-backed securities
AFS - Fair Value
Less than 12 Months	9,134	9,235
12 Months or More	0	0
Total	9,134	9,235
AFS - Unrealized Loss
Less than 12 Months	211	125
12 Months or More	0	0
Total	211	125
Agency residential collateralized mortgage obligations
AFS - Fair Value
Less than 12 Months	141,955	128,869
12 Months or More	52,868	49,171
Total	194,823	178,040
AFS - Unrealized Loss
Less than 12 Months	3,235	1,860
12 Months or More	2,214	1,565
Total	5,449	3,425
Municipal bonds
AFS - Fair Value
Less than 12 Months	18,694	10,114
12 Months or More	3,719	6,583
Total	22,413	16,697
AFS - Unrealized Loss
Less than 12 Months	284	72
12 Months or More	123	236
Total	$ 407	$ 308

Securities - Held-to-Maturity S

Securities - Held-to-Maturity Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
HTM - Fair Value
Less than 12 Months	$ 55,738	$ 41,403
12 Months or More	31,542	33,146
Total	87,280	74,549
HTM - Unrealized Loss
Less than 12 Months	1,000	376
12 Months or More	1,258	756
Total	2,258	1,132
Agency residential mortgage-backed securities
HTM - Fair Value
Less than 12 Months	19,773	20,397
12 Months or More	15,838	16,909
Total	35,611	37,306
HTM - Unrealized Loss
Less than 12 Months	530	206
12 Months or More	716	440
Total	1,246	646
Agency commercial mortgage-backed securities
HTM - Fair Value
Less than 12 Months	15,222	3,685
12 Months or More	3,405	3,484
Total	18,627	7,169
HTM - Unrealized Loss
Less than 12 Months	121	26
12 Months or More	127	72
Total	248	98
Agency residential collateralized mortgage obligations
HTM - Fair Value
Less than 12 Months	9,274	8,008
12 Months or More	2,003	2,267
Total	11,277	10,275
HTM - Unrealized Loss
Less than 12 Months	106	64
12 Months or More	35	35
Total	141	99
Municipal bonds
HTM - Fair Value
Less than 12 Months	11,469	9,313
12 Months or More	10,296	10,486
Total	21,765	19,799
HTM - Unrealized Loss
Less than 12 Months	243	80
12 Months or More	380	209
Total	$ 623	$ 289

Loans - Narrative (Details)

Loans - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment - Warehouse Purchase Program	$ 1,019,840,000		$ 1,320,846,000
Loans held for investment	6,569,123,000	$ 6,067,587,000	6,483,192,000
Allowance for loan impairment related to PCI loans	314,000	225,000	269,000
Threshold at which large consumer real estate loans are individually evaluated for impairment	$ 417,000
Period after which past due loans are considered delinquent	30 days
Period after which interest income on delinquent loans is discontinued	90 days
Period of time at which delinquent loans are typically charged off	120 days
Number of loans past due over 90 days and still accruing interest	$ 0		0
Number of PCI loans considered non-performing	$ 0
Minimum nonaccrual period for TDRs	6 months
Number of loans modified as a TDR that experienced subsequent payment in the preceding twelve months	$ 0	0
Period at which loan is defined as defaulted	90 days
Period which non-performing other consumer loans are on nonaccrual status	90 days
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 1,967,443,000	$ 1,830,671,000	1,927,049,000
Reclassification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment - Warehouse Purchase Program	144,270,000		166,258,000
Reclassification | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ (144,270,000)		$ (166,258,000)

Loans - Loans (Details)

Loans - Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at fair value	$ 31,123	$ 16,707
Loans held for investment	6,569,123	6,483,192	$ 6,067,587
Net of:
Deferred costs (fees) and discounts, net	7,630	6,380
Allowance for loan losses	(74,508)	(71,301)
Net loans held for investment, excluding Warehouse Purchase Program	6,502,245	6,418,271
Warehouse Purchase Program	1,019,840	1,320,846
Total loans held for investment	7,522,085	7,739,117
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,053,750	3,019,339	2,786,477
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,967,443	1,927,049	1,830,671
Construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	252,213	277,864	290,258
Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,252,433	1,213,434	1,109,459
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 43,284	$ 45,506	$ 50,722

Loans - Allowance for Loan Loss

Loans - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Allowance for loan losses:
Beginning balance	$ 71,301	$ 64,576
Charge-offs	(12,527)	(17,246)
Recoveries	99	626
Provision expense (benefit)	15,635	22,700
Ending balance	74,508	70,656
Allowance ending balance:
Individually evaluated for impairment	11,562	9,925
Collectively evaluated for impairment	62,946	60,731
Loans:
Individually evaluated for impairment	47,135	102,896
Collectively evaluated for impairment	6,518,604	5,957,794
PCI loans	3,384	6,897
Total Loans	6,569,123	6,067,587	$ 6,483,192
Commercial Real Estate
Allowance for loan losses:
Beginning balance	21,587	18,303
Charge-offs	(3)	(16)
Recoveries	0	205
Provision expense (benefit)	(46)	866
Ending balance	21,538	19,358
Allowance ending balance:
Individually evaluated for impairment	56	37
Collectively evaluated for impairment	21,482	19,321
Loans:
Individually evaluated for impairment	3,748	4,336
Collectively evaluated for impairment	3,047,695	2,776,564
PCI loans	2,307	5,577
Total Loans	3,053,750	2,786,477	3,019,339
Commercial and Industrial
Allowance for loan losses:
Beginning balance	39,005	35,464
Charge-offs	(12,236)	(16,530)
Recoveries	22	40
Provision expense (benefit)	15,973	21,912
Ending balance	42,764	40,886
Allowance ending balance:
Individually evaluated for impairment	11,250	9,337
Collectively evaluated for impairment	31,514	31,549
Loans:
Individually evaluated for impairment	40,453	94,494
Collectively evaluated for impairment	1,926,847	1,735,969
PCI loans	143	208
Total Loans	1,967,443	1,830,671	1,927,049
Construction and Land
Allowance for loan losses:
Beginning balance	4,644	5,075
Charge-offs	0	(418)
Recoveries	0	0
Provision expense (benefit)	(706)	(98)
Ending balance	3,938	4,559
Allowance ending balance:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	3,938	4,559
Loans:
Individually evaluated for impairment	0	310
Collectively evaluated for impairment	252,213	289,948
PCI loans	0	0
Total Loans	252,213	290,258	277,864
Consumer Real Estate
Allowance for loan losses:
Beginning balance	4,838	4,484
Charge-offs	0	(35)
Recoveries	11	12
Provision expense (benefit)	180	(76)
Ending balance	5,029	4,385
Allowance ending balance:
Individually evaluated for impairment	226	180
Collectively evaluated for impairment	4,803	4,205
Loans:
Individually evaluated for impairment	2,911	2,783
Collectively evaluated for impairment	1,248,769	1,105,793
PCI loans	753	883
Total Loans	1,252,433	1,109,459	1,213,434
Other Consumer
Allowance for loan losses:
Beginning balance	1,227	1,250
Charge-offs	(288)	(247)
Recoveries	66	369
Provision expense (benefit)	234	96
Ending balance	1,239	1,468
Allowance ending balance:
Individually evaluated for impairment	30	371
Collectively evaluated for impairment	1,209	1,097
Loans:
Individually evaluated for impairment	23	973
Collectively evaluated for impairment	43,080	49,520
PCI loans	181	229
Total Loans	$ 43,284	$ 50,722	$ 45,506

Loans - Allowance for Off-Balan

Loans - Allowance for Off-Balance Sheet Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Allowance for loan losses:
Beginning balance	$ 71,301	$ 64,576
Charge-offs on lending-related commitments	(12,527)	(17,246)
Ending balance	74,508	70,656
Other liabilities
Allowance for loan losses:
Beginning balance	929	1,573
Charge-offs on lending-related commitments	0	0
Provision (benefit) for credit losses on lending-related commitments	28	(399)
Ending balance	$ 957	$ 1,174

Loans - Impaired Loans (Details

Loans - Impaired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	$ 49,911	$ 97,740
Recorded Investment With No Allowance	23,775	55,598
Recorded Investment With Allowance	23,360	35,568
Total Recorded Investment	47,135	91,166
Related Allowance	11,248	10,522
Commercial real estate
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	4,069	4,411
Recorded Investment With No Allowance	3,748	4,134
Recorded Investment With Allowance	0	0
Total Recorded Investment	3,748	4,134
Related Allowance	0	0
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	42,309	89,713
Recorded Investment With No Allowance	17,111	48,463
Recorded Investment With Allowance	23,342	35,542
Total Recorded Investment	40,453	84,005
Related Allowance	11,234	10,502
Consumer real estate
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	3,472	3,545
Recorded Investment With No Allowance	2,905	2,985
Recorded Investment With Allowance	6	7
Total Recorded Investment	2,911	2,992
Related Allowance	6	7
Other consumer
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	61	71
Recorded Investment With No Allowance	11	16
Recorded Investment With Allowance	12	19
Total Recorded Investment	23	35
Related Allowance	$ 8	$ 13

Loans - Income on Impaired Loan

Loans - Income on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 70,154	$ 103,769
Interest Income Recognized	11	6
Commercial real estate
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	3,879	4,966
Interest Income Recognized	2	2
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	63,294	88,076
Interest Income Recognized	0	0
Construction and land
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	0	7,388
Interest Income Recognized	0	0
Consumer real estate
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	2,952	3,042
Interest Income Recognized	8	3
Other consumer
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	29	297
Interest Income Recognized	$ 1	$ 1

Loans - Non-Performing (Nonaccr

Loans - Non-Performing (Nonaccrual) Loans (Details) - Non-performing - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-performing loans	$ 49,836	$ 94,403
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-performing loans	3,748	4,134
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-performing loans	40,455	84,003
Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-performing loans	5,548	6,190
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-performing loans	$ 85	$ 76

Loans - Outstanding Balances of

Loans - Outstanding Balances of TDRs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
TDRs	$ 17,849	$ 18,062
Outstanding commitments to lend additional funds to borrowers with TDR loans	$ 0	0
Minimum nonaccrual period for TDRs	6 months
Nonaccrual TDRs
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
TDRs	$ 17,117	17,294
Performing TDRs
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
TDRs	$ 732	$ 768

Loans - Recorded Balances of Lo

Loans - Recorded Balances of Loans Modified as TDRs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	$ 83	$ 14,592
Principal Deferrals
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	83	0
Other
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	0	14,592
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	83	14,592
Commercial and industrial | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	83	0
Commercial and industrial | Other
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	$ 0	$ 14,592

Loans - Carrying Amount of Acqu

Loans - Carrying Amount of Acquired PCI Loans Included in the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Receivables [Abstract]
Carrying amount	$ 3,070	$ 3,295
Outstanding balance	3,804	3,992
Allowance for loan losses	$ 314	$ 269	$ 225

Loans - Changes in the Accretab

Loans - Changes in the Accretable Yield for Acquired PCI Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	$ 2,279	$ 2,515
Reclassifications (to) from nonaccretable	51	198
Disposals	(64)	0
Accretion	(99)	(186)
Balance at end of period	$ 2,167	$ 2,527

Loans - Analysis of Age of Reco

Loans - Analysis of Age of Recorded Investment in Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	$ 63,488	$ 49,228
Current Loans	6,505,635	6,433,964
Total Loans	6,569,123	6,483,192	$ 6,067,587
Carrying value of PCI loans acquired	3,371	3,338
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	61,037	37,013
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	370	3,246
90 Days and Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	2,081	8,969
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	40,817	9,664
Current Loans	3,012,933	3,009,675
Total Loans	3,053,750	3,019,339	2,786,477
Commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	40,817	9,414
Commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	0	0
Commercial real estate | 90 Days and Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	0	250
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	4,353	8,552
Current Loans	1,963,090	1,918,497
Total Loans	1,967,443	1,927,049	1,830,671
Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	2,891	918
Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	122	284
Commercial and industrial | 90 Days and Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	1,340	7,350
Construction and land
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	891	9,354
Current Loans	251,322	268,510
Total Loans	252,213	277,864	290,258
Construction and land | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	891	9,354
Construction and land | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	0	0
Construction and land | 90 Days and Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	0	0
Consumer real estate
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	17,034	20,731
Current Loans	1,235,399	1,192,703
Total Loans	1,252,433	1,213,434	1,109,459
Consumer real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	16,097	16,436
Consumer real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	196	2,928
Consumer real estate | 90 Days and Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	741	1,367
Other consumer
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	393	927
Current Loans	42,891	44,579
Total Loans	43,284	45,506	$ 50,722
Other consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	341	891
Other consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	52	34
Other consumer | 90 Days and Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	$ 0	$ 2

Loans - Real Estate and Commerc

Loans - Real Estate and Commercial and Industrial Credit Risk Profile by Internally Assigned Grade (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	$ 6,569,123	$ 6,483,192	$ 6,067,587
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	3,053,750	3,019,339	2,786,477
Commercial Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	3,026,208	2,980,656
Commercial Real Estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	19,929	30,656
Commercial Real Estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	7,613	8,027
Commercial Real Estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	0	0
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	1,967,443	1,927,049	1,830,671
Commercial and Industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	1,848,915	1,787,238
Commercial and Industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	38,292	43,161
Commercial and Industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	80,196	96,546
Commercial and Industrial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	40	104
Construction and Land
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	252,213	277,864	290,258
Construction and Land | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	252,213	277,864
Construction and Land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	0	0
Construction and Land | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	0	0
Construction and Land | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	0	0
Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	1,252,433	1,213,434	$ 1,109,459
Consumer Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	1,243,095	1,203,236
Consumer Real Estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	1,376	1,408
Consumer Real Estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	7,196	7,762
Consumer Real Estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	$ 766	$ 1,028

Loans - Consumer Credit Exposur

Loans - Consumer Credit Exposure Credit Risk Profile Based on Payment Activity (Details) - Other consumer - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Other consumer credit exposure	$ 43,284	$ 45,506
Performing
Financing Receivable, Recorded Investment [Line Items]
Other consumer credit exposure	43,199	45,430
Non-performing
Financing Receivable, Recorded Investment [Line Items]
Other consumer credit exposure	$ 85	$ 76

Fair Value - Assets and Liabili

Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	$ 431,413	$ 419,717
Aggregate principal balance of loans held for sale	30,304	16,242
Interest rate lock commitments | Not designated as a hedging instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	445	358
Liabilities	0	0
Forward mortgage-backed securities trades | Not designated as a hedging instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	0	7
Liabilities	118	18
Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	431,413	419,717
Level 2 | Recurring | Not designated as a hedging instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	31,123	16,707
Level 2 | Recurring | Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	445	358
Liabilities	0	0
Level 2 | Recurring | Forward mortgage-backed securities trades
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	0	7
Liabilities	118	18
Level 2 | Recurring | Interest rate swap | Loan customer counterparty
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	0	0
Liabilities	2,576	1,735
Level 2 | Recurring | Interest rate swap | Financial institution counterparty
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	2,576	1,735
Liabilities	0	0
Level 2 | Recurring | Agency residential mortgage-backed securities | Not designated as a hedging instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	177,304	189,466
Level 2 | Recurring | Agency commercial mortgage-backed securities | Not designated as a hedging instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	9,133	9,235
Level 2 | Recurring | Agency residential collateralized mortgage obligations | Not designated as a hedging instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	211,332	184,216
Level 2 | Recurring | US government and agency securities | Not designated as a hedging instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	1,546	1,671
Level 2 | Recurring | Municipal bonds | Not designated as a hedging instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	$ 32,098	$ 35,129

Fair Value - Narrative (Details

Fair Value - Narrative (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans on real estate, pending foreclosures	$ 704,000
Non-recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value on a non-recurring basis	$ 0	$ 0

Fair Value - Assets and Liabi55

Fair Value - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Details) - Level 3 - Non-recurring - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 12,112	$ 25,046
Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	6,694	6,694
Construction and land
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	800	859
Consumer real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	0	192
Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	$ 666	$ 687

Fair Value - Carrying Amount an

Fair Value - Carrying Amount and Fair Value of Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financial Assets at Carrying Value
Cash and cash equivalents	$ 294,904	$ 293,456	$ 355,028	$ 289,212
Securities held to maturity	156,898	173,509
Loans held for investment, net	6,502,245	6,418,271
Loans held for investment - Warehouse Purchase Program	1,019,840	1,320,846
Financial Assets at Fair value
Securities held to maturity	156,034	174,926
FHLB and other restricted securities, at cost	46,842	64,790
Accrued interest receivable	24,322	24,596
Financial Liabilities at Carrying Value
Deposits	6,954,407	6,767,683
FHLB advances	604,562	1,043,163
Repurchase agreements	76,610	84,676
Subordinated debt	134,645	134,522
Accrued interest payable	4,608	2,729
Level 1
Financial Assets at Fair value
Cash and cash equivalents	294,904	293,456
Securities held to maturity	0	0
Loans held for investment, net	0	0
Loans held for investment - Warehouse Purchase Program	0	0
FHLB and other restricted securities, at cost	0	0
Accrued interest receivable	24,322	24,596
Financial Liabilities at Fair Value
Deposits	0	0
FHLB advances	0	0
Repurchase agreement	0	0
Subordinated debt	0	0
Accrued interest payable	4,608	2,729
Level 2
Financial Assets at Fair value
Cash and cash equivalents	0	0
Securities held to maturity	156,034	174,926
Loans held for investment, net	0	0
Loans held for investment - Warehouse Purchase Program	0	0
FHLB and other restricted securities, at cost	46,842	64,790
Accrued interest receivable	0	0
Financial Liabilities at Fair Value
Deposits	0	0
FHLB advances	0	0
Repurchase agreement	0	0
Subordinated debt	0	0
Accrued interest payable	0	0
Level 3
Financial Assets at Fair value
Cash and cash equivalents	0	0
Securities held to maturity	0	0
Loans held for investment, net	6,486,126	6,484,949
Loans held for investment - Warehouse Purchase Program	1,019,778	1,337,612
FHLB and other restricted securities, at cost	0	0
Accrued interest receivable	0	0
Financial Liabilities at Fair Value
Deposits	6,407,215	6,326,572
FHLB advances	604,758	1,043,416
Repurchase agreement	72,920	81,041
Subordinated debt	142,531	141,972
Accrued interest payable	$ 0	$ 0

Derivative Financial Instrume57

Derivative Financial Instruments - Notional Balances and Fair Values of Outstanding Positions (Details) - Not designated as hedging - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
IRLCs
Derivative [Line Items]
Outstanding Notional Balance	$ 13,460	$ 10,337
Asset Derivative Fair Value	445	358
Liability Derivative Fair Value	0	0
Forward mortgage-backed securities trades
Derivative [Line Items]
Outstanding Notional Balance	32,133	19,788
Asset Derivative Fair Value	0	7
Liability Derivative Fair Value	118	18
Commercial loan | Commercial loan interest rate swaps and caps | Loan customer counterparty
Derivative [Line Items]
Outstanding Notional Balance	113,904	114,594
Asset Derivative Fair Value	0	0
Liability Derivative Fair Value	2,576	1,735
Commercial loan | Commercial loan interest rate swaps and caps | Financial institution counterparty
Derivative [Line Items]
Outstanding Notional Balance	113,904	114,594
Asset Derivative Fair Value	2,576	1,735
Liability Derivative Fair Value	$ 0	$ 0

Derivative Financial Instrume58

Derivative Financial Instruments - Weighted Average Received Received and Paid Interest Rates for Interest Rate Swaps Outstanding (Details) - Commercial loan - Loan customer counterparty - Interest rate swap - Not designated as hedging	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Received	2.51%	2.52%
Paid	2.86%	2.54%

Derivative Financial Instrume59

Derivative Financial Instruments - Narrative (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Cash collateral pledged	$ 1,950,000	$ 1,950,000
Interest rate swap
Derivative [Line Items]
Credit exposure	0	$ 32,000
Interest rate swap | Financial institution counterparty
Derivative [Line Items]
Credit exposure	$ 2,617,000

Derivative Financial Instrume60

Derivative Financial Instruments - Income (Loss) from Derivatives not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
IRLCs
Derivative [Line Items]
Derivatives not designated as hedging instruments	$ 87	$ 172
Forward mortgage-backed securities trades
Derivative [Line Items]
Derivatives not designated as hedging instruments	$ 399	$ (112)

Share-based Compensation - Comp

Share-based Compensation - Compensation Cost Charged to Income for Share-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Compensation cost charged to income for:
Income tax benefit	$ 432	$ 547
Restricted stock
Compensation cost charged to income for:
Compensation cost	1,064	868
Stock options
Compensation cost charged to income for:
Compensation cost	$ 991	$ 694

Share-based Compensation - Summ

Share-based Compensation - Summary of Nonvested Share Activity in Restricted Stock (Details)	3 Months Ended
	Mar. 31, 2018$ / sharesshares
Time-Vested Shares
Shares
Beginning balance (in shares) | shares	128,588
Granted (in shares) | shares	35,650
Vested (in shares) | shares	(48,600)
Ending balance (in shares) | shares	115,638
Weighted-Average Grant Date Fair Value per Share
Beginning balance (in dollars per share) | $ / shares	$ 27.27
Granted (usd per share) | $ / shares	42.40
Vested (usd per share) | $ / shares	21.27
Ending balance (in dollars per share) | $ / shares	$ 34.45
Performance-Based Shares
Shares
Beginning balance (in shares) | shares	73,008
Granted (in shares) | shares	26,550
Vested (in shares) | shares	(20,600)
Ending balance (in shares) | shares	78,958
Weighted-Average Grant Date Fair Value per Share
Beginning balance (in dollars per share) | $ / shares	$ 42.21
Granted (usd per share) | $ / shares	42.82
Vested (usd per share) | $ / shares	44.04
Ending balance (in dollars per share) | $ / shares	$ 42.82
Percent increase in awarded amount over target if performance metrics are met	200.00%
Additional percent increase or decrease in total share award at vesting	20.00%

Share-based Compensation - Narr

Share-based Compensation - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to non-vested shares awarded	$ 5,067
Weighted-average period expense recognition period	1 year 9 months 4 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to non-vested shares awarded	$ 6,740
Weighted-average period expense recognition period	1 year 10 months 1 day

Share-based Compensation - Su64

Share-based Compensation - Summary of Activity in Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Shares
Beginning balance (in shares)	2,207,243
Exercised (in shares)	(111,926)
Forfeited (in shares)	(32,375)
Ending balance (in shares)	2,062,942	2,207,243
Fully vested and expected to vest (in shares)	2,055,462
Exercisable (in shares)	989,931
Weighted- Average Exercise Price per Share
Beginning balance (in dollars per share)	$ 26.88
Exercised (in dollars per share)	23.77
Forfeited (in dollars per share)	31.41
Ending balance (in dollars per share)	26.97	$ 26.88
Fully vested and expected to vest (in dollars per share)	26.95
Exercisable (in dollars per share)	$ 22.41
Weighted- Average Remaining Contractual Term
Beginning balance	9 years 10 months 24 days	10 years 1 month 6 days
Ending balance	9 years 10 months 24 days	10 years 1 month 6 days
Fully vested and expected to vest	9 years 10 months 24 days
Exercisable	7 years 1 month 6 days
Aggregate Intrinsic Value
Beginning balance	$ 32,693	$ 33,848
Ending balance	32,693	$ 33,848
Fully vested and expected to vest	32,619
Exercisable	$ 20,205

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provisional amount recorded related to remeasurement of deferred tax asset			$ 13,493
Reclassification of income tax effects of the Tax Cuts and Jobs Act	$ 741	$ 0

Income Taxes - Summary of Net D

Income Taxes - Summary of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net deferred tax assets	$ 21,689	$ 20,240
Estimated annual effective tax rate	21.00%

Commitments and Contingent Li67

Commitments and Contingent Liabilities - Contractual Amounts of Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Total unused commitments/capacity	$ 2,830,966	$ 2,373,297
Unused capacity on Warehouse Purchase Program loans
Loss Contingencies [Line Items]
Total unused commitments/capacity	1,057,160	738,412
Unused commitments to extend credit
Loss Contingencies [Line Items]
Total unused commitments/capacity	1,740,403	1,600,794
Unused line of credit | Standby letters of credit
Loss Contingencies [Line Items]
Total unused commitments/capacity	$ 33,403	$ 34,091

Commitments and Contingent Li68

Commitments and Contingent Liabilities - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Overdraft protection	$ 85,860	$ 84,727
Unfunded commitments	1,100	1,680
FHLB letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loans pledged as collateral	1,021,510	944,370
Allowance for credit losses on off-balance sheet lending-related commitments and guarantees | Other liabilities
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Valuation reserves	957	929
Financial guarantee
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Credit card guarantees	$ 5,680	$ 5,257