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	$ 15,112	$ 10,813
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,980	1,905
Provision (credit) for loan losses	194	1,236	$ 5,546
Share based compensation expense	496	477
Tax benefits associated with share based compensation	239	77
Deferred income tax expense	(214)	626
Origination of loans held for sale	(34,895)	(26,862)
Proceeds from sales of loans held for sale	41,850	32,592
Gains on sales of loans held for sale	924	493
Loss on sales of other real estate owned	(17)	72
Investment securities gains	(2)	(1,769)
Increase (Decrease) in Operating Capital [Abstract]
Net (increase) decrease in accrued interest receivable	57	(239)
Net (increase) decrease in other assets	(195)	(565)
Net increase (decrease) in accrued expenses and other liabilities	6,076	(3,731)
Other - net	2,654	788
Net cash provided by operating activities	34,259	15,913
Investing activities:
Proceeds of other equity securities	4,483	3,807
Purchases of investments available-for-sale	(105,028)	0
Proceeds from sales of investment available-for-sale	0	40,863
Proceeds from maturities, calls and principal payments of investments held-to-maturity	0	5,004
Proceeds from maturities, calls and principal payments of investments available-for-sale	25,296	59,561
Net increase in loans and leases	(77,674)	(83,890)
Proceeds from the sales of other real estate owned	759	163
Expenditures for premises and equipment	(1,131)	(1,451)
Net cash used in investing activities	(153,295)	24,057
Financing activities:
Net increase (decrease) in deposits	221,654	148,578
Net increase (decrease) in retail repurchase agreements and federal funds purchased	16,125	11,898
Proceeds from advances from FHLB	1,130,000	760,000
Repayment of advances from FHLB	(1,245,000)	(855,000)
Retirement of subordinated debt	(30,000)	0
Proceeds from issuance of common stock	276	184
Repurchase of common stock	0	(13,273)
Dividends paid	(6,275)	(5,843)
Net cash provided by financing activities	86,780	46,544
Net increase (decrease) in cash and cash equivalents	(32,256)	86,514
Cash and cash equivalents at beginning of period	134,125	72,882	72,882
Cash and cash equivalents at end of period	101,869	159,396	$ 134,125
Supplemental Disclosures:
Interest payments	5,936	5,795
Income tax payments	7	6,396
Transfer of Investments Held-to-maturity to Available For Sale Securities	0	203,118
Transfer from loans to residential mortgage loans held for sale	12,374	18,752
Transfers from loans to other real estate owned	$ 113	$ 0