Consolidated Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income		$ 91,801,000	$ 46,916,000	$ 65,719,000
(Reversal of provision) provision for credit losses		(10,132,000)	40,794,000	8,511,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment		4,662,000	4,780,000	5,277,000
Net gain on sales of investment securities	[1]	(145,000)	(871,000)	(54,000)
Net gain on mortgage banking activities	[1]	(15,141,000)	(16,442,000)	(3,946,000)
Bank owned life insurance income	[1]	(3,981,000)	(2,940,000)	(3,179,000)
Net amortization of investment securities premiums and discounts		2,676,000	2,594,000	1,738,000
Amortization, fair market value adjustments and capitalization of servicing rights		(1,470,000)	218,000	141,000
Net (accretion) amortization of acquisition accounting fair value adjustments		(144,000)	42,000	(761,000)
Stock-based compensation		3,698,000	1,480,000	2,348,000
Intangible expenses		979,000	1,216,000	1,595,000
Other adjustments to reconcile net income to cash used in by operating activities		(4,963,000)	(5,485,000)	(1,635,000)
Deferred tax expense (benefit)		3,553,000	(9,854,000)	(1,807,000)
Originations of loans held for sale		(495,710,000)	(484,842,000)	(227,083,000)
Proceeds from the sale of loans held for sale		527,855,000	468,070,000	227,473,000
Contributions to pension and other postretirement benefit plans		(265,000)	(270,000)	(266,000)
Increase in accrued interest receivable and other assets		(3,131,000)	(2,835,000)	(2,332,000)
Increase in accrued interest payable and other liabilities		2,195,000	8,608,000	1,409,000
Net cash provided by operating activities		102,337,000	51,179,000	73,148,000
Cash flows from investing activities:
Net cash paid due to acquisitions		3,820,000	0	0
Proceeds from sale of premises and equipment		0	4,000	1,410,000
Purchases of premises and equipment		(5,878,000)	(3,753,000)	(3,856,000)
Proceeds from maturities, calls and principal repayments of securities held-to-maturity		64,583,000	81,850,000	34,207,000
Proceeds from maturities, calls and principal repayments of securities available-for-sale		50,431,000	54,758,000	67,020,000
Proceeds from sales		4,636,000	66,421,000	26,494,000
Purchases of investment securities held-to-maturity		91,979,000	43,115,000	84,733,000
Purchases of investment securities available-for-sale		(154,270,000)	(91,273,000)	(2,993,000)
Proceeds from sales of money market mutual funds		7,328,000	12,297,000	5,035,000
Payments to Acquire Trading Securities Held-for-investment		(6,887,000)	(13,139,000)	(5,413,000)
Net (increase) decrease in other investments		(3,000)	71,000	83,000
Proceeds from sale of loans originally held-for-investment		996,000	14,416,000	0
Net increase in loans and leases		(2,171,000)	(947,204,000)	(381,343,000)
Proceeds from sales of other real estate owned		7,255,000	1,275,000	720,000
Proceeds from bank owned life insurance		3,000,000	0	0
Net cash used in investing activities		(126,779,000)	(867,392,000)	(343,369,000)
Cash flows from financing activities:
Net increase in deposits		812,375,000	882,625,000	474,190,000
Net increase (decrease) in short-term borrowings		2,200,000	(774,000)	(171,088,000)
Proceeds from issuance of long-term debt		0	125,000,000	25,000,000
Repayment of long-term debt		(15,000,000)	(165,000,000)	(20,000,000)
Proceeds from issuance of subordinated notes		0	100,000,000	0
Payments of Debt Issuance Costs		0	(1,552,000)	0
Repayment of subordinated notes		(85,000,000)	(10,000,000)	0
Payment of contingent consideration on acquisitions		(58,000)	(121,000)	(129,000)
Payment for shares withheld to cover taxes on vesting of restricted stock units		(355,000)	(70,000)	0
Purchases of treasury stock		(295,000)	(4,382,000)	(2,045,000)
Stock issued under dividend reinvestment and employee stock purchase plans		2,384,000	2,369,000	2,233,000
Proceeds from exercise of stock options		2,058,000	384,000	1,203,000
Cash dividends paid		(23,575,000)	(17,536,000)	(23,435,000)
Net cash provided by financing activities		694,734,000	910,943,000	285,929,000
Net increase in cash and cash equivalents		670,292,000	94,730,000	15,708,000
Cash and cash equivalents at beginning of year		219,858,000	125,128,000	109,420,000
Cash and cash equivalents at end of year		890,150,000	219,858,000	125,128,000
Supplemental disclosures of cash flow information:
Cash paid for interest		21,824,000	29,233,000	44,479,000
Cash paid for income taxes, net of refunds		26,589,000	17,316,000	17,171,000
Non cash transactions:
Transfer of loans to other real estate owned		126,000	8,405,000	71,000
Transfer of loans to loans held for sale		996,000	14,416,000	0
Contingent consideration recorded as goodwill		$ 1,618,000	$ 0	$ 0

[1] Net interest income as well as many other revenues for financial assets and liabilities including loans, leases, securities, and derivatives are excluded from the scope of FASB ASC 606 "Revenue from Contracts with Customers" (FASB ASC 606). Noninterest income streams that are out of scope of FASB ASC 606 include bank owned life insurance income, sales of investment securities and mortgage banking activities.