Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities
Net income	$ 63,077	$ 49,370	$ 46,249
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	44,250	2,905	1,176
Depreciation	6,512	4,231	3,688
Net amortization of premium and discounts on loans, securities, deposits and debt obligations	(5,157)	730	861
Amortization of mortgage servicing rights, net of impairment charges/recoveries	15,456	2,043	1,209
Amortization of intangibles	6,449	1,119	1,312
Gain on sale of loans	(36,683)	(7,932)	(4,819)
Loss on sale or disposals or write-downs of property, plant and equipment		10	13
(Gain) loss on sale or write-down of OREO and other assets held for sale	(10)	180	581
(Gain) on sale of available for sale securities	(1,464)	(24)	(173)
Unrealized gain on equity securities	(90)
Change in deferred taxes	(9,781)	(419)	881
Proceeds from sale of loans held for sale	847,141	302,554	212,688
Origination of loans held for sale	(967,861)	(308,434)	(205,884)
Stock option expense	2,312	286	420
Restricted stock vesting	(1,371)	560	568
Excess tax benefit (expense) on stock compensation plans		(108)	(154)
Income from bank owned life insurance	(3,306)	(2,158)	(1,767)
Changes in:
Accrued interest receivable and other assets	(14,729)	(6,916)	(2,878)
Other liabilities	(363)	1,688	(916)
Net cash provided by operating activities	(55,618)	39,685	53,055
Investing Activities
Proceeds from maturities, calls and paydowns of held-to-maturity securities		120	122
Proceeds from maturities, calls and paydowns of available-for-sale securities	124,731	49,104	32,620
Proceeds from sale of available-for-sale securities	52,420	2,667	5,503
Proceeds from sale of OREO	1,081	1,262	887
Proceeds from sale of office properties and equipment			14
Purchases of available-for-sale securities	(362,426)	(33,463)	(76,647)
Purchases of equity securities	(1,000)
Purchases of office properties and equipment	(5,361)	(3,134)	(4,168)
Investment in bank owned life insurance		(6,600)
Proceeds from bank owned life insurance death benefit		874	337
Proceeds from sale of bank owned life insurance			17,689
Proceeds from FHLB stock redemption	8,642	2,302	1,775
Net cash received (paid) in acquisitions	52,448	(1,600)
Proceeds from sale of non-mortgage loans	5,241	21,239	28,729
Net increase in loans receivable	(417,630)	(258,119)	(219,885)
Net cash used in investing activities	(541,854)	(225,348)	(213,024)
Financing Activities
Net increase in deposits	1,098,867	249,443	183,037
Net increase advance payments by borrowers	(10,035)	1,839	727
Net change in Federal Home Loan Bank advances and PPPLF	(466,063)	(126)	910
Proceeds from subordinated debentures	48,777
Decrease in securities sold under repurchase agreements	(2,999)	(2,742)	(20,278)
Cash dividends paid on common stock	(32,898)	(15,624)	(13,043)
Net cash paid for repurchase of common stock	(10,183)	(15,147)	(6,330)
Proceeds from exercise of stock options		189	111
Proceeds from direct treasury stock sales	18	123	104
Net cash provided by financing activities	625,484	217,955	145,238
Increase (decrease) in cash and cash equivalents	28,012	32,292	(14,731)
Cash and cash equivalents at beginning of period	131,254	98,962	113,693
Cash and cash equivalents at end of period	159,266	131,254	98,962
Supplemental cash flow information:
Interest paid	30,536	25,348	16,198
Income taxes paid	32,390	11,200	7,950
Transfer from other liability to equity			636
Transfers from held to maturity securities to available for sale securities		404
Transfers from loans to other real estate owned and other assets held for sale	192	337	$ 1,141
Initial recognition of right-of-use asset	10,106	8,808
Initial recognition of lease liability	10,254	$ 9,339
Initial recognition ASU 326	$ 2,566