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Consolidated Statement of Cash Flows (Statement) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]      
Net Income (Loss) Attributable to Parent $ 151,420,000 $ 126,734,000 $ 148,351,000
Financing Receivable, Credit Loss, Expense (Reversal) 14,543,000 2,904,000 4,557,000
Amortization of Deferred Loan Origination Fees, Net (8,892,000) (8,759,000) (12,085,000)
Depreciation 12,192,000 14,015,000 13,819,000
Accretion (Amortization) of Discounts and Premiums, Investments 1,606,000 3,794,000 3,666,000
Deferred Income Tax Expense (Benefit) (409,000) (703,000) 611,000
Gain (Loss) on Sale of Investments (526,000) (7,875,000) 0
Gain on equity securities, net 3,080,000 971,000 2,955,000
Share-based Payment Arrangement, Noncash Expense 7,669,000 8,010,000 7,199,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement (6,148,000) 0 0
Payments for Loan Originations, Loans to be Sold in Secondary Market 115,906,000 65,211,000 173,880,000
Proceeds From Loan Sales 115,602,000 65,338,000 185,361,000
Gain (Loss) on Sale of Loans and Leases     495,000
Gains (Losses) on Sales of Other Real Estate 42,000 (3,000) 5,611,000
Real Estate Owned, Valuation Allowance, Valuation Increase (30,000) (60,000) (12,039,000)
Gain (Loss) on Sale of Other Loans and Leases 0 0 (495,000)
Bank Owned Life Insurance Income 7,770,000 5,338,000 6,100,000
Investment Program, Proportional Amortization Method, Applied, Amortization Expense 8,126,000 8,265,000 7,743,000
Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract]      
Increase (Decrease) in Other Operating Assets (8,872,000) (3,479,000) 3,021,000
Increase (Decrease) in Other Operating Liabilities 1,067,000 (6,982,000) (4,814,000)
Net cash provided by operating activities 178,848,000 151,137,000 136,642,000
Payments for (Proceeds from) Federal Home Loan Bank Stock [Abstract]      
Proceeds from Sale of Federal Home Loan Bank Stock 18,371,000 11,672,000 2,216,000
Payments to Acquire Federal Home Loan Bank Stock (9,225,000) (18,228,000) 0
Proceeds from Sale, Maturity and Collection of Investments [Abstract]      
Proceeds from Sale of Debt Securities 44,037,000 284,454,000 0
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale 299,702,000 145,310,000 186,123,000
Proceeds from Sale of Other Real Estate 1,095,000 965,000 17,684,000
Payments to Acquire Investments [Abstract]      
Payments to Acquire Debt Securities, Available-for-sale 2,882,000 3,981,000 317,278,000
Payments to Acquire Available-for-sale Securities, Equity 10,213,000 2,195,000 9,165,000
Payments for (Proceeds from) Investments (1,288,000) 1,886,000 331,000
Payments for (Proceeds from) Loans and Leases 341,500,000 330,443,000 273,526,000
Proceeds from Sale of Other Loans Held-for-sale 0 0 4,345,000
Proceeds from Life Insurance Policy 12,466,000 1,816,000 9,587,000
Payment to Acquire Life Insurance Policy, Investing Activities (9,937,000) (10,779,000) (7,500,000)
Payments for Affordable Housing Programs 10,591,000 9,364,000 10,352,000
Payments to Acquire Property, Plant, and Equipment 9,183,000 7,589,000 7,937,000
Net cash used in investing activities (19,148,000) 63,524,000 (405,472,000)
Net Cash Provided by (Used in) Financing Activities [Abstract]      
Increase (Decrease) in Deposits 214,961,000 (386,901,000) (456,929,000)
(Increase) decrease in one way sell deposits (114,001,000) 194,752,000 787,116,000
Proceeds from (Repayments of) Short-term Debt (237,750,000) 100,840,000 (11,444,000)
Payments Related to Tax Withholding for Share-based Compensation 3,116,000 2,844,000 2,761,000
Payments for Repurchase of Common Stock 0 23,017,000 0
Payments of Ordinary Dividends 77,496,000 68,951,000 76,604,000
Net cash (used in) provided by financing activities (217,402,000) (186,121,000) 239,378,000
Cash and Cash Equivalents, Period Increase (Decrease), Total (57,702,000) 28,540,000 (29,452,000)
Cash and Cash Equivalents, at Carrying Value, Beginning Balance 218,268,000 189,728,000 219,180,000
Cash and Cash Equivalents, at Carrying Value, Ending Balance 160,566,000 218,268,000 189,728,000
Supplemental Cash Flow Information [Abstract]      
Interest Paid, Excluding Capitalized Interest, Operating Activities 123,947,000 95,183,000 30,818,000
Income Taxes Paid 23,260,000 17,200,000 24,670,000
Noncash Investing and Financing Items [Abstract]      
Real Estate Owned, Transfer to Real Estate Owned 1,008,000 1,097,000 13,418,000
Transfer of Portfolio Loans and Leases to Held-for-sale 0 0 3,890,000
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 2,718,000 545,000 7,867,000
Affordable Housing Program Obligation, Period Increase (Decrease) 11,500,000 10,000,000 10,000,000
Transfer to Investments 2,500,000 2,745,000 16,250,000
Mortgages [Member]      
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]      
Gain (Loss) on Sale of Loans and Leases 2,011,000 1,213,000 4,243,000
Consumer Portfolio Segment [Member]      
Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract]      
Increase (Decrease) in Prepaid Expense $ 1,513,000 $ (43,000) $ (9,422,000)