CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net income	$ 32,640	$ 33,106
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment	2,364	2,084
Provision for loan losses	4,000	13,500
Increase in valuation allowance	15,325
Amortization of intangibles	555	627
Net accretion of loans	(1,106)	(3,381)
Accretion on bank premises	(58)	(94)
Accretion on deposits	(19)	(167)
Accretion on borrowings	(156)	(250)
Stock-based compensation	1,315	1,650
Gains on sales of investment securities, net	(1,596)	(4,234)
Gains on sales of loans held-for-sale, net	(120)	(147)
Gains on sales of fixed assets, net	(8)
Loans originated for resale	(6,790)	(6,399)
Proceeds from sale of loans held-for sale	12,015	4,948
Net loss (gain) on sale of other real estate owned	82	(182)
Increase in cash surrender value of bank owned life insurance	(2,403)	(1,843)
Amortization of premiums and accretion of discounts on investments securities, net	1,808	1,148
(Increase) decrease in accrued interest receivable	(1,876)	48
Decrease (increase) in other assets	8,895	(2,813)
Increase (decrease) in other liabilities	3,444	(981)
Net cash provided by operating activities	68,311	36,620
Investment securities available-for-sale:
Purchases	(138,945)	(114,844)
Sales	29,543	85,253
Maturities, calls and principal repayments	61,700	109,452
Investment securities held-to-maturity:
Purchases		(1,000)
Maturities and principal repayments		14,758
Net (purchases) redemptions of restricted investment in bank stocks	(5,362)	8,077
Payments on loans held-for-sale	2,841
Net increase in loans	(447,457)	(359,945)
Proceeds from sales of fixed assets	8
Purchases of premises and equipment	(2,148)	(1,769)
Purchases of bank owned life insurance	(10,000)	(17,000)
Proceeds from sale of other real estate owned	1,124	2,992
Net cash used in investing activities	(508,696)	(274,026)
Cash flows from financing activities
Net increase in deposits	279,517	478,150
Advances of Federal Home Loan Bank ("FHLB") borrowings	780,000	375,000
Repayments of FHLB borrowings	(656,000)	(565,000)
Repayment of repurchase agreement	(15,000)
Cash dividends paid on common stock	(7,207)	(6,805)
Cash dividends paid on preferred stock		(22)
Common stock issuance costs	(180)
Redemption of preferred stock		(11,250)
Proceeds from exercise of stock options	118	232
Net cash provided by financing activities	381,248	270,305
Net change in cash and cash equivalents	(59,137)	32,899
Cash and cash equivalents at beginning of period	200,399	200,895
Cash and cash equivalents at end of period	141,262	233,794
Cash payments for:
Interest paid on deposits and borrowings	25,807	22,791
Income taxes	4,670	18,195
Supplemental disclosures of noncash investing activities
Transfer of loans to other real estate owned	580	887
Transfer of loans from held-for-investment to held-for-sale	34,652	13,514
Transfer of investment securities from held-to-maturity to available-for-sale		$ 209,855