Consolidated Condensed Statements Of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating activities:
Net Income (Loss) Attributable to Parent	$ 115,267,000	$ 117,397,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (recovery of) credit losses	1,576,000	(6,923,000)
Amortization of Deferred Loan Origination Fees, Net	(9,869,000)	(20,601,000)
Depreciation	10,341,000	9,951,000
Amortization of investment securities, net	2,596,000	1,442,000
Depreciation, Amortization and Accretion, Net	(402,000)	(1,375,000)
Gain on equity securities, net	(3,120,000)	(2,886,000)
Loan originations to be sold in secondary market	(157,868,000)	(465,278,000)
Proceeds from sale of loans in secondary market	169,212,000	503,032,000
Gain on sale of loans in secondary market	(495,000)	0
Share-based compensation expense	4,796,000	4,496,000
Gains (Losses) on Sales of Other Real Estate	(5,611,000)	26,000
Real Estate Owned, Valuation Allowance, Valuation Increase	(12,039,000)	(13,000)
Bank owned life insurance income	(4,734,000)	(3,776,000)
Investment in qualified affordable housing tax credits amortization	5,940,000	5,567,000
Changes in assets and liabilities:
Increase in other assets	(2,302,000)	(11,021,000)
(Decrease) increase in other liabilities	(8,963,000)	986,000
Net cash provided by operating activities	89,613,000	112,622,000
Investing activities:
Payments for (Proceeds from) Federal Home Loan Bank Stock	2,216,000	8,677,000
Proceeds from Sale of Debt Securities, Available-for-sale	0	934,000
Proceeds from Sale, Maturity and Collection of Investments [Abstract]
Available-for-sale securities	148,192,000	176,926,000
Payments to Acquire Investments [Abstract]
Payments to Acquire Debt Securities, Available-for-sale	(316,878,000)	(637,123,000)
Equity securities	(9,165,000)	0
Net loan originations, portfolio loans	(234,239,000)	269,366,000
Proceeds from Sale of Other Assets, Investing Activities	4,345,000	3,688,000
Payments for Affordable Housing Programs	(10,004,000)	(6,182,000)
Proceeds from the sale of OREO	17,684,000	659,000
Life insurance death benefits	8,380,000	4,862,000
Payment to Acquire Life Insurance Policy, Investing Activities	(7,500,000)	0
Purchases of premises and equipment	(6,576,000)	(10,670,000)
Net cash used in investing activities	(403,153,000)	(186,208,000)
Financing activities:
Net increase in deposits	188,536,000	900,305,000
Increase (Decrease) in Other Deposits	216,869,000	(108,239,000)
Net decrease in short-term borrowings	(49,293,000)	(106,251,000)
Repayments of Long-term Debt	0	(32,500,000)
Payment, Tax Withholding, Share-based Payment Arrangement	(2,761,000)	(2,403,000)
Payments for Repurchase of Common Stock	0	(16,048,000)
Cash dividends paid	(51,558,000)	(54,357,000)
Net cash provided by financing activities	301,793,000	580,507,000
Increase in cash and cash equivalents	(11,747,000)	506,921,000
Cash and cash equivalents at beginning of year	219,180,000	370,474,000
Cash and cash equivalents at end of period	207,433,000	877,395,000
Supplemental disclosures of cash flow information:
Cash paid for interest	18,805,000	14,930,000
Income Taxes Paid	16,070,000	16,430,000
Non cash activities:
Real Estate Owned, Transfer to Real Estate Owned	13,418,000	78,000
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	4,270,000	547,000
Affordable Housing Program Obligation, Period Increase (Decrease)	10,000,000	10,000,000
Debt Securities [Member]
Non cash activities:
Transfer to Investments	0	52,508,000
Equity
Non cash activities:
Transfer to Investments	15,000,000	0
Other Investments
Payments to Acquire Investments [Abstract]
Payments to Acquire Other Investments	(392,000)	(2,655,000)
Consumer Portfolio Segment [Member]
Changes in assets and liabilities:
Increase in prepaid dealer premiums	(10,827,000)	(3,370,000)
Mortgage Loans on Real Estate [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of loans in secondary market	$ (3,885,000)	$ (15,032,000)