Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Operating Activities:
Net income	$ 22,549	$ 32,266
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for credit losses	1,000	(5,000)	$ (13,000)
Depreciation and amortization	6,307	6,721
Amortization of intangibles	880	1,032
Amortization of debt securities premium and discount, net	2,651	3,332
Share-based compensation expense	2,100	1,645
Security gains, net	(2)	(14)
Net deferred loan origination expense	(1,583)	(1,523)
Excess tax benefit from exercise of stock options	(314)	(521)
Increase in interest receivable	(500)	(948)
Increase (decrease) in interest payable	234	(29)
Realized gain on mortgages sold	(10,615)	(9,124)
Proceeds from mortgages sold	329,730	269,213
Origination of mortgages held for sale	(315,374)	(311,115)
Loss on other real estate owned, net	843	1,394
Increase in bank-owned life insurance	(1,893)	(1,813)
Other, net	2,700	7,153
Net cash provided by (used in) operating activities	38,713	(7,331)
Investing activities:
Proceeds from calls and maturities of available-for-sale securities	121,593	75,917
Proceeds from sales of available-for-sale securities		1,110
Purchases of available-for-sale securities	(43,316)	(118,760)
Net increase in loans and leases	(72,647)	(16,098)
Purchases of premises and equipment	(5,653)	(7,384)
Proceeds from sale of premises and equipment	640	271
Purchase of bank-owned life insurance, net of proceeds from death benefits		2,742
Proceeds from sale of other real estate owned	2,562	7,391
Other, net	(29)	(6)
Net cash provided by (used in) investing activities	3,150	(54,817)
Financing activities:
Net increase in deposits	155,536	280,315
Net decrease in short-term debt and other liabilities	(36,852)	(5,341)
Repayment of long-term debt	(2,094)	(2,093)
Issuance of common stock	8	825
Repurchase of common stock	(867)	(2,288)
Excess tax benefit from exercise of stock options	314	521
Payment of cash dividends	(9,424)	(7,235)
Net cash provided by financing activities	106,621	264,704
Increase in cash and cash equivalents	148,484	202,556
Cash and cash equivalents at beginning of period	197,969	357,250	357,250
Cash and cash equivalents at end of period	$ 346,453	$ 559,806	$ 197,969