Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 31,581	$ 38,665
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation expense	2,994	2,383
Amortization of core deposit intangibles	1,605	1,221
Capitalization of mortgage servicing rights	(30,890)	(18,392)
Amortization of mortgage servicing rights	6,221	1,543
Impairment of mortgage servicing rights	8,089
Stock-based compensation expense	3,373
Provision for loan losses	(727)	(937)
Provision for mortgage loan repurchases	1,173	1,021
Accretion of yield on purchased loans	(3,195)
Accretion of discounts and amortization of premiums on securities, net	1,471	1,125
Bargain purchase gain		(2,794)
Gain on sales of securities	(4,407)	(1,842)
Origination of loans held for sale	(3,121,252)	(2,067,466)
Proceeds from sale of loans held for sale	2,987,252	2,020,502
Gain on sale and change in fair value of loans held for sale	(85,154)	(49,101)
Net (gain) loss on sales or write-downs of foreclosed assets	(1,504)	43
Gain (loss) on other assets	(24)	380
Provision for deferred income tax	14,239	1,177
Changes in:
Other assets and interest receivable	(47,046)	(153,073)
Accrued expenses and other liabilities	10,504	71,771
Net cash used in operating activities	(225,697)	(153,774)
Activity in available-for-sale securities:
Sales	270,663	268,830
Maturities, prepayments and calls	78,661	79,771
Purchases	(244,221)	(141,290)
Net increase in loans	(85,209)	(154,336)
Purchases of premises and equipment	(3,683)	(2,928)
Proceeds from the sale of foreclosed assets	6,558	2,205
Proceeds from the sale of premises and equipment		16
Net cash received in business combination		23,995
Net cash provided by investing activities	22,769	76,263
Cash flows from financing activities:
Net increase in demand and savings deposits	128,133	137,248
Net increase (decrease) in time deposits	73,465	(31,235)
Net decrease in securities sold under agreements to repurchase	(75,996)	(32,776)
Increase in short-term borrowings	62,000	59,440
Payments on long-term debt	(11,325)	(7,297)
Net proceeds from sale of common stock	115,525
Dividends paid	(69,300)	(21,100)
Net cash provided by financing activities	222,502	104,280
Net change in cash and cash equivalents	19,574	26,769
Cash and cash equivalents at beginning of the period	97,723	49,954
Cash and cash equivalents at end of the period	117,297	76,723
Supplemental cash flow information
Interest paid	7,041	6,731
Taxes paid	1,307	1,754
Supplemental noncash disclosures:
Transfers from loans to foreclosed real estate	2,636	2,284
Transfers from foreclosed real estate to loans	259	785
Transfers from loans held for sale to loans	5,749	4,245
Conversion of cash-settled to stock-settled compensation	5,388
Trade date receivable- securities	$ 32,648	$ 73,737