Consolidated statements of cash flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 745	$ 19,588
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	1,612	1,172
Amortization of core deposit and other intangibles	1,203	729
Capitalization of mortgage servicing rights	(7,796)	(8,720)
Net change in fair value of mortgage servicing rights	20,736	4,358
Stock-based compensation expense	1,883	1,638
Provision for loan losses	27,964	1,391
Provision for credit losses on unfunded commitments	1,601	0
Provision for mortgage loan repurchases	372	59
Accretion of yield on purchased loans	(1,578)	(1,831)
Accretion of discounts and amortization of premiums on securities, net	906	614
Gain from securities, net	(63)	(43)
Originations of loans held for sale	(1,097,672)	(932,125)
Repurchases of loans held for sale	0	(5,957)
Proceeds from sale of loans held for sale	1,070,137	986,454
Gain on sale and change in fair value of loans held for sale	(33,595)	(18,151)
Net (gain) loss or write-downs of other real estate owned	(51)	39
Loss (gain) on other assets	328	(191)
Provision for deferred income taxes	(8,088)	(4,219)
Changes in:
Operating leases	(42)	0
Other assets and interest receivable	(119,820)	(22,511)
Accrued expenses and other liabilities	39,520	10,133
Net cash (used in) provided by operating activities	(101,698)	32,427
Activity in available-for-sale securities:
Sales	0	1,758
Maturities, prepayments and calls	27,657	20,814
Purchases	(29,632)	(24,196)
Net change in loans	52,701	(118,358)
Proceeds from sale of mortgage servicing rights	0	29,160
Purchases of premises and equipment	(3,014)	(911)
Proceeds from the sale of premises and equipment	0	284
Proceeds from the sale of other real estate owned	1,442	716
Net cash paid in business combination	(4,227)	0
Net cash provided by (used) in investing activities	44,927	(90,733)
Cash flows from financing activities:
Net increase in demand deposits	272,566	107,959
Net (decrease) increase in time deposits	(40,107)	23,515
Net increase in securities sold under agreements to repurchase and federal funds purchased	4,955	21,614
Payments on FHLB advances	0	(20,212)
Proceeds from other borrowings	15,000	0
Share based compensation witholding payment	(838)	(2,373)
Net proceeds from sale of common stock	446	364
Dividends paid	(2,838)	(2,503)
Net cash provided by financing activities	249,184	128,364
Net change in cash and cash equivalents	192,413	70,058
Cash and cash equivalents at beginning of the period	232,681	125,356
Cash and cash equivalents at end of the period	425,094	195,414
Supplemental cash flow information:
Interest paid	10,997	10,820
Taxes paid	105	77
Supplemental noncash disclosures:
Transfers from loans to other real estate owned	365	1,106
Transfers from other real estate owned to premises and equipment	841	0
Loans provided for sales of other real estate owned	0	166
Transfers from loans to loans held for sale	3,101	0
Transfers from loans held for sale to loans	1,445	540
Stock consideration paid in business combination	35,041	0
Trade date payable - securities	8,273	2,524
Dividends declared not paid on restricted stock units	28	84
Decrease to retained earnings for adoption of new accounting standards	25,018	(1,309)
Right-of-use assets obtained in exchange for operating lease liabilities	$ 480	$ 33,819