CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income		$ 41,680	$ 32,640
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment		2,336	2,364
Provision for loan losses		20,000	4,000
Increase in valuation allowance			15,325
Amortization of intangibles		483	555
Net accretion of loans		(969)	(1,106)
Accretion on bank premises		(46)	(58)
Accretion on deposits		(46)	(19)
Accretion on borrowings		(98)	(156)
Stock-based compensation expense		499	1,315
Gains on sales of investment securities, net	[1]		(1,596)	[2]
Change in fair value of equity securities, net		325
Gains on sales of loans held-for-sale, net		(31)	(120)
Gains on sales of fixed assets, net			(8)
Loans originated for resale		(2,206)	(6,790)
Proceeds from sale of loans held-for-sale		2,337	12,015
Net loss on sale of other real estate owned		192	82
Net increase in cash surrender value of bank owned life insurance		(1,715)	(2,402)
Amortization of premiums and accretion of discounts on investments securities, net		2,577	1,808
Amortization of subordinated debt issuance costs		250	124
Increase in accrued interest receivable		(2,220)	(1,876)
Decrease in other assets		42	8,770
Increase in other liabilities		3,945	3,444
Net cash provided by operating activities		67,335	68,311
Investment securities available-for-sale:
Purchases		(114,457)	(138,945)
Sales			29,543
Maturities, calls and principal repayments		115,757	61,700
Net redemptions (purchases) of restricted investment in bank stocks		1,011	(5,362)
Payments on loans held-for-sale		159	2,841
Net increase in loans		(283,283)	(447,457)
Proceeds from sales of fixed assets			8
Purchases of premises and equipment		(1,629)	(2,148)
Purchases of bank owned life insurance			(10,000)
Proceeds from sale of other real estate owned		884	1,124
Net cash used in investing activities		(281,558)	(508,696)
Cash flows from financing activities
Net increase in deposits		193,683	279,517
Increase in subordinated debentures		73,525
Advances of Federal Home Loan Bank ("FHLB") borrowings		1,256,000	780,000
Repayments of FHLB borrowings		(1,296,000)	(656,000)
Repayment of repurchase agreement			(15,000)
Cash dividends paid on common stock		(7,243)	(7,207)
Common stock issuance costs			(180)
Proceeds from exercise of stock options		524	118
Net cash provided by financing activities		220,489	381,248
Net change in cash and cash equivalents		6,266	(59,137)
Cash and cash equivalents at beginning of period		149,582	200,399
Cash and cash equivalents at end of period		155,848	141,262
Cash payments for:
Interest paid on deposits and borrowings		40,200	25,807
Income taxes		2,507	4,670
Supplemental disclosures of noncash investing activities
Transfer of loans to other real estate owned		538	580
Transfer of loans held-for-investment to loans held-for-sale		21,236	34,652
Transfer of loans held-for-sale to held-for-investment		$ 45,552

[1] Not within scope of ASC 606.

[2] The Company elected the modified respective approach of adoption; therefore, prior period balances are presented under legacy GAAP and may not be comparable to current year presentation.