Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Operating Activities:
Net income	$ 38,093	$ 22,549
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for credit losses	1,000	1,000	$ 4,000
Depreciation and amortization	6,485	6,307
Amortization of intangibles	1,030	880
Amortization of debt securities premium and discount, net	1,871	2,651
Share-based compensation expense	1,501	2,100
Security gains, net	(1,071)	(2)
Net deferred loan origination expense	(1,582)	(1,583)
Increase in interest receivable	(324)	(500)
Increase (decrease) in interest payable	134	234
Realized gain on mortgages sold	(10,910)	(10,615)
Proceeds from mortgages sold	304,077	329,730
Origination of mortgages held for sale	(287,790)	(315,374)
Loss on other real estate owned, net	632	843
Increase in bank-owned life insurance	(1,669)	(1,893)
Other, net	22,121	2,700
Net cash provided by (used in) operating activities	73,598	39,027
Investing activities:
Proceeds from calls and maturities of available-for-sale securities	116,781	121,593
Proceeds from sales of available-for-sale securities	1,071
Purchases of available-for-sale securities	(128,364)	(43,316)
Net increase in loans and leases	10,073	(72,647)
Purchases of premises and equipment	(7,463)	(5,653)
Proceeds from sale of premises and equipment	68	640
Proceeds from death benefits from COLI	1,799
Proceeds from sale of other real estate owned	986	2,562
Other, net	(97)	(29)
Net cash provided by (used in) investing activities	(5,146)	3,150
Financing activities:
Net increase in deposits	354,704	155,536
Net decrease in short-term debt and other liabilities	(78,170)	(36,852)
Repayment of long-term debt	(92,000)	(2,094)
Redemption of Junior Subordinated Debt	(12,888)
Issuance of common stock	429	8
Repurchase of common stock	(50,399)	(867)
Payment of cash dividends	(11,671)	(9,424)
Net cash provided by financing activities	110,005	106,307
Increase in cash and cash equivalents	178,457	148,484
Cash and cash equivalents at beginning of period	222,965	197,969	197,969
Cash and cash equivalents at end of period	401,422	346,453	$ 222,965
Supplemental Cash Flow Information
Income tax (refunds) payments, net	(680)	6,000
Interest paid	8,090	6,193
Transfers of loans to other real estate owned	2,266	1,359
MSR fair value adjustment	911	(7,954)
Financed sales of other real estate owned	180	$ 160
Transfers of loans held for sale to loan portfolio	$ 52