Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 19,754	$ 9,753
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	1,106	1,002
Amortization of core deposits and other intangibles	853	392
Capitalization of mortgage servicing rights	(13,510)	(15,013)
Net change in fair value of mortgage servicing rights	(3,543)	501
Stock-based compensation expense	1,958	1,352
Provision for loan losses	317	(257)
Provision for mortgage loan repurchases	186	183
Accretion of yield on purchased loans	(1,687)	(1,160)
Accretion of discounts and amortization of premiums on securities, net	697	708
Loss (gain) from securities, net	47	(1)
Originations of loans held for sale	(1,617,103)	(1,346,535)
Proceeds from sale of loans held for sale	1,707,527	1,507,296
Gain on sale and change in fair value of loans held for sale	(23,391)	(22,833)
Net loss (gain) or write-downs of other real estate owned	186	(748)
Loss on other assets	(68)
Provision for deferred income taxes	5,482	5,425
Changes in:
Other assets and interest receivable	(4,759)	11,954
Accrued expenses and other liabilities	(26,207)	(4,107)
Net cash provided by operating activities	47,845	147,912
Activity in available-for-sale securities:
Sales	221
Maturities, prepayments and calls	16,503	19,480
Purchases	(81,990)	(4,987)
Net increase in loans	(74,928)	(46,190)
Purchases of premises and equipment	(704)	(459)
Proceeds from the sale of other real estate owned	1,432	2,228
Net cash used in investing activities	(139,466)	(29,928)
Cash flows from financing activities:
Net increase in demand and savings deposits	83,076	31,135
Net increase (decrease) in time deposits	18,680	(1,498)
Net increase (decrease) in securities sold under agreements to repurchase	431	(3,431)
Decrease in short-term borrowings	(51,293)	(150,000)
Decrease in long-term debt	(3,716)	(340)
Share based compensation withholding obligation	(2,277)	(625)
Net proceeds from sale of common stock	669
Net cash provided by (used in) financing activities	45,570	(124,759)
Net change in cash and cash equivalents	(46,051)	(6,775)
Cash and cash equivalents at beginning of the period	119,751	136,327
Cash and cash equivalents at end of the period	73,700	129,552
Supplemental cash flow information:
Interest paid	6,066	2,330
Taxes paid	31	31
Supplemental noncash disclosures:
Transfers from loans to other real estate owned	630	888
Transfers from other real estate owned to loans	120
Transfers from loans held for sale to loans	1,599	4,341
Derecognition of rebooked GNMA delinquent loans (See Note 1)	43,035
Trade date payable - securities	3,912
Adoption of ASU 2016-01 (See Note 1)	$ (109)
Fair value election of mortgage servicing rights		$ 1,011