Consolidated Statements Of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities
Net Income Available to Common Shareholders	$ 114,365,000	$ 102,071,000	$ 88,080,000
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and (accretion), net	6,165,000	10,451,000	8,782,000
Provision for (recovery of) credit losses	3,243,000	474,000	(3,165,000)
Depreciation of premises and equipment	4,556,000	5,325,000	5,831,000
Deferred income tax expense (benefit)	(2,764,000)	1,469,000	2,185,000
Net periodic employee benefit cost	(52,000)	256,000	569,000
Pension contributions	0	0	(1,000,000)
Unrealized and realized securities losses (gains)	4,476,000	1,581,000	(816,000)
Stock-based compensation expense	3,213,000	3,276,000	3,121,000
Excess tax benefit from stock-compensation expense	228,000	(292,000)	(579,000)
Increase in value of bank-owned life insurance	(6,037,000)	(5,559,000)	(3,895,000)
Loans originated for sale	(11,159,000)	(31,150,000)	(42,420,000)
Proceeds from the sale of loans originated for sale	11,306,000	31,475,000	42,769,000
Gain on sale of loans	(147,000)	(325,000)	(349,000)
Change in accrued interest receivable	(1,136,000)	(2,660,000)	166,000
Change in other assets	14,526,000	(20,643,000)	(8,737,000)
Change in other liabilities	(3,203,000)	20,068,000	11,731,000
Net Cash Provided by Operating Activities	137,580,000	115,817,000	102,273,000
Investing Activities
Net (increase) decrease in loans	(223,785,000)	(102,991,000)	76,992,000
Purchases	93,681,000	519,262,000	560,689,000
Proceeds from sales	205,627,000	0	0
Proceeds from maturities and calls	119,090,000	210,912,000	291,562,000
Purchases	(8,029,000)	(302,000)	(154,000)
Proceeds from sales	536,000	449,000	4,813,000
Proceeds from maturities and calls	780,000	0	0
Purchases of premises and equipment	(2,962,000)	(2,141,000)	(3,323,000)
Proceeds from the disposals of premises and equipment	283,000	190,000	367,000
Proceeds from the disposition of assets held-for-sale	0	0	0
Proceeds from bank-owned life insurance policies	10,856,000	6,045,000	2,156,000
Payments for low income housing tax credits	(8,051,000)	(3,352,000)	(2,891,000)
Acquisition of Citizens Commerce Bancshares, Inc.	14,016,000	0	0
Net Cash Used in Investing Activities	14,680,000	(410,452,000)	(191,167,000)
Financing Activities
Net (decrease) increase in noninterest-bearing deposits	(68,906,000)	(21,710,000)	196,135,000
Net (decrease) increase in interest-bearing deposits	(165,414,000)	(33,677,000)	77,178,000
Net increase (decrease) in short-term borrowings	37,392,000	(21,494,000)	16,502,000
Proceeds from long-term debt	100,000,000	0	0
Purchases of treasury stock	(60,134,000)	(26,449,000)	(58,678,000)
Proceeds from exercise of stock options	0	798,000	691,000
Other financing activities	1,071,000	(762,000)	(824,000)
Dividends paid	(39,993,000)	(36,702,000)	(36,138,000)
Net Cash (Used) Provided by Financing Activities	(195,984,000)	(139,996,000)	194,866,000
(Decrease) Increase in Cash and Cash Equivalents	(43,724,000)	(434,631,000)	105,972,000
Cash and cash equivalents at beginning of period	200,000,000	634,631,000	528,659,000
Cash and Cash Equivalents at End of Period	156,276,000	200,000,000	634,631,000
Supplemental Cash Flow Information [Abstract]
Interest paid	49,134,000	9,467,000	11,100,000
Income taxes paid	32,813,000	22,434,000	18,495,000
Goodwill	149,902,000	108,941,000	108,941,000
Core deposit intangible	12,666,000	6,793,000	8,179,000
Citizens Commerce Bancshares, Inc.
Identifiable assets acquired (net of purchase consideration)	319,961,000	0	0
Liabilities assumed	307,617,000	0	0
Goodwill	40,961,000	0	0
Citizens Commerce Bancshares, Inc. | Core Deposits
Core deposit intangible	$ 8,278,000	$ 0	$ 0