CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 22,537	$ 55,784	$ 39,421
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	44,361	16,985	9,430
Depreciation on premises and equipment	6,942	6,583	6,166
Amortization of intangible assets	6,504	7,090	6,956
Amortization of operating lease right-of-use asset	2,547	2,937	0
Amortization of loan servicing rights	3,518	2,820	2,949
Share-based compensation expense	2,175	2,364	1,533
Increase in cash surrender value of life insurance	(3,581)	(3,640)	(3,579)
Investment securities amortization, net	3,411	3,757	3,898
Gain on sales of investment securities, net	(1,721)	(674)	(464)
Gain on sales of other real estate owned	(78)	(185)	(544)
Impairment on other real estate owned	1,390	16	301
Origination of loans held for sale	(786,203)	(504,973)	(557,305)
Proceeds from sales of loans held for sale	1,218,950	949,745	590,282
Gain on loans sold and held for sale	(14,071)	(15,082)	(11,165)
Impairment (recapture) on commercial mortgage servicing rights	12,337	2,139	(449)
Loss (gain) on mortgage servicing rights held for sale	1,692	(490)	458
Impairment related to facilities optimization	12,847	3,577	0
Gain on proceeds from bank-owned life insurance	0	0	(709)
Net change in operating assets and liabilities:
Accrued interest receivable	(7,199)	1,399	(431)
Other assets	(31,961)	(4,701)	(5,745)
Accrued expenses and other liabilities	4,750	13,202	16,090
Net cash provided by operating activities	499,147	538,653	97,093
Cash flows from investing activities:
Purchases of investment securities available for sale	(266,514)	(200,231)	(76,289)
Proceeds from sales of investment securities available for sale	28,256	33,464	20,178
Maturities and payments on investment securities available for sale	214,036	239,760	131,220
Purchases of equity securities	(3,345)	(82)	(59)
Proceeds from sales of equity securities	0	105	7,733
Net increase in loans	(1,279,913)	(505,501)	(131,114)
Proceeds from sale of commercial FHA origination platform	7,502	0	0
Purchases of premises and equipment	(2,589)	(5,538)	(7,200)
Purchases of nonmarketable equity securities	(12,091)	(14,263)	(20,737)
Proceeds from sales of nonmarketable equity securities	0	12,684	15,099
Proceeds from sales of mortgage servicing rights held for sale	0	3,288	12,994
Proceeds from sales of other real estate owned	2,225	1,647	3,879
Proceeds from settlements of bank-owned life insurance	0	0	1,449
Net cash acquired in acquisitions	0	69,879	36,153
Net cash used in investing activities	(1,312,433)	(364,788)	(6,694)
Cash flows from financing activities:
Net increase (decrease) in deposits	556,762	148,344	(168,049)
Net decrease in short-term borrowings	(13,072)	(42,206)	(31,891)
Proceeds from FHLB borrowings	729,000	360,000	1,017,080
Payments made on FHLB borrowings and other borrowings	(447,832)	(515,047)	(891,012)
FHLB advances prepayment fees	4,872	0	0
Proceeds from issuance of subordinated debt, net of issuance costs	0	98,265	0
Payments made on subordinated debt	(7,443)	(19,543)	0
Subordinated debt prepayment fees	193	1,778	0
Cash dividends paid on preferred stock	0	(191)	(330)
Redemption of preferred stock	(10)	(2,636)	0
Cash dividends paid on common stock	(24,958)	(23,599)	(19,977)
Common stock repurchased	(39,615)	(4,019)	0
Proceeds from issuance of common stock under employee benefit plans	2,524	5,794	2,278
Net cash provided by (used in) financing activities	760,421	6,940	(91,901)
Net (decrease) increase in cash and cash equivalents	(52,865)	180,805	(1,502)
Cash and cash equivalents:
Beginning of period	394,505	213,700	215,202
End of period	$ 341,640	$ 394,505	$ 213,700