Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 74,389	$ 21,042
Adjustments to reconcile net income to net cash provided by operating activities:
(Reversal of provision) provision for credit losses	(11,524)	49,515
Depreciation of premises and equipment	3,523	3,620
Net amortization of investment securities premiums and discounts	2,078	1,755
Net gain on sales of investment securities	(140)	(817)
Net gain on mortgage banking activities	(12,623)	(12,119)
Bank owned life insurance income	(3,262)	(2,207)
Stock-based compensation	2,674	1,853
Intangible expenses	712	934
Other adjustments to reconcile net income to cash used in operating activities	(4,956)	(3,392)
Originations of loans held for sale	(396,418)	(322,135)
Proceeds from the sale of loans held for sale	417,920	321,233
Contributions to pension and other postretirement benefit plans	(198)	(203)
Increase in accrued interest receivable and other assets	(882)	(18,774)
(Decrease) increase in accrued interest payable and other liabilities	(5,750)	5,786
Net cash provided by operating activities	65,543	46,091
Cash flows from investing activities:
Purchases of premises and equipment	(3,241)	(2,363)
Proceeds from maturities, calls and principal repayments of securities held-to-maturity	52,121	56,933
Proceeds from maturities, calls and principal repayments of securities available-for-sale	40,088	43,853
Proceeds from sales of securities available-for-sale	4,135	65,621
Purchases of investment securities held-to-maturity	(14,852)	(43,116)
Purchases of investment securities available-for-sale	(102,585)	(49,329)
Proceeds from sales of money market mutual funds	5,818	10,487
Purchases of money market mutual funds	(5,336)	(10,971)
Net decrease in other investments	(496)	(1,469)
Proceeds from sale of loans originally held-for-investment	996	0
Proceeds from sale of portfolio loans	0	14,416
Net decrease (increase) in loans and leases	54,661	(851,403)
Proceeds from sales of other real estate owned	7,255	75
Proceeds from bank owned life insurance	2,302	0
Net cash provided by (used in) investing activities	40,866	(767,266)
Cash flows from financing activities:
Net increase in deposits	695,414	851,521
Net decrease in short-term borrowings	(3,805)	(999)
Proceeds from issuance of long-term debt	0	125,000
Repayment of long-term debt	(15,000)	(70,000)
Proceeds from issuance of subordinated notes	0	98,448
Repayment of subordinated debt	(85,000)	0
Payment of contingent consideration on acquisitions	(58)	(91)
Purchases of treasury stock	(650)	(4,452)
Stock issued under dividend reinvestment and employee stock purchase plans	1,824	1,757
Proceeds from exercise of stock options	1,045	94
Cash dividends paid	(17,680)	(17,555)
Net cash provided by financing activities	576,090	983,723
Net increase in cash and cash equivalents	682,499	262,548
Cash and cash equivalents at beginning of year	219,858	125,128
Cash and cash equivalents at end of period	902,357	387,676
Supplemental disclosures of cash flow information:
Cash paid for interest	18,516	23,089
Cash paid for income taxes, net of refunds	22,327	12,014
Transfer of loans to other real estate owned	126	8,125
Transfer of loans to loans held for sale	$ 996	$ 14,416