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Consolidated Statement of Cash Flows (Statement) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]      
Net Income (Loss) Attributable to Parent $ 148,351,000 $ 153,945,000 $ 127,923,000
Provision for (recovery of) credit losses 4,557,000 (11,916,000) 12,054,000
Amortization of Deferred Loan Origination Fees, Net (12,085,000) (25,185,000) (21,598,000)
Goodwill, Purchase Accounting Adjustments (334,000) (1,519,000) (2,403,000)
Depreciation 13,819,000 13,267,000 10,814,000
Accretion (Amortization) of Discounts and Premiums, Investments 3,666,000 2,174,000 1,362,000
Payment for Debt Extinguishment or Debt Prepayment Cost 0 0 10,529,000
Deferred Income Tax Expense (Benefit) 611,000 (3,131,000) (4,525,000)
Gain (Loss) on Sale of Investments 0 0 3,286,000
Gain on equity securities, net 2,955,000 5,011,000 2,182,000
Share-based Payment Arrangement, Noncash Expense 7,199,000 8,021,000 7,272,000
Payments for Loan Originations, Loans to be Sold in Secondary Market 173,880,000 569,080,000 1,026,346,000
Proceeds From Loan Sales 185,361,000 609,377,000 1,031,227,000
Gain (Loss) on Sale of Loans and Leases 495,000    
Gains (Losses) on Sales of Other Real Estate 5,611,000 (4,000) 1,207,000
Real Estate Owned, Valuation Allowance, Valuation Increase (12,039,000) (64,000) (105,000)
Gain (Loss) on Sale of Other Loans and Leases (495,000) 0 0
Bank Owned Life Insurance Income 6,100,000 4,897,000 4,789,000
Amortization Method Qualified Affordable Housing Project Investments, Amortization 7,743,000 7,313,000 7,046,000
Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract]      
Increase (Decrease) in Other Operating Assets 4,467,000 (12,406,000) (9,321,000)
Increase (Decrease) in Other Operating Liabilities (4,814,000) (7,939,000) (6,302,000)
Net cash provided by operating activities 134,862,000 157,332,000 111,646,000
Net Cash Provided by (Used in) Investing Activities [Abstract]      
Payments for (Proceeds from) Federal Home Loan Bank Stock (2,216,000) (8,677,000) (7,970,000)
Proceeds from Sale of Debt Securities 0 934,000 312,160,000
Proceeds from Sale, Maturity and Collection of Investments [Abstract]      
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale 186,123,000 232,197,000 223,728,000
Payments to Acquire Investments [Abstract]      
Payments to Acquire Debt Securities, Available-for-sale 317,278,000 953,900,000 354,299,000
Payments to Acquire Available-for-sale Securities, Equity 9,165,000 0 3,567,000
Increase (Decrease) in Equity Securities, FV-NI (331,000) (2,597,000) (2,120,000)
Payments for (Proceeds from) Loans and Leases 271,753,000 (312,187,000) 620,200,000
Proceeds from Sale of Other Loans Held-for-sale 4,345,000 3,718,000 4,400,000
Proceeds from Sale of Other Real Estate 17,684,000 758,000 5,654,000
Proceeds from Life Insurance Policy 9,587,000 5,598,000 1,360,000
Payment to Acquire Life Insurance Policy, Investing Activities (7,500,000) 0 0
Payments for Affordable Housing Programs 10,352,000 10,814,000 6,596,000
Payments to Acquire Property, Plant, and Equipment 7,937,000 14,093,000 28,632,000
Net cash used in investing activities (403,699,000) (412,141,000) (455,902,000)
Net Cash Provided by (Used in) Financing Activities [Abstract]      
Increase (Decrease) in Deposits (456,922,000) 605,168,000 1,230,073,000
(Increase) decrease in one way sell deposits 787,116,000 (272,952,000) (710,101,000)
Proceeds from (Repayments of) Short-term Debt (11,444,000) (103,444,000) 111,573,000
Proceeds from Issuance of Subordinated Long-term Debt 0 0 172,620,000
Repayments of Long-term Debt 0 32,500,000 170,529,000
Payments Related to Tax Withholding for Share-based Compensation 2,761,000 2,403,000 1,002,000
Payments for Repurchase of Common Stock 0 16,048,000 7,507,000
Payments of Ordinary Dividends 76,604,000 74,306,000 70,353,000
Net cash provided by financing activities 239,385,000 103,515,000 554,774,000
Cash and Cash Equivalents, Period Increase (Decrease), Total (29,452,000) (151,294,000) 210,518,000
Cash and Cash Equivalents, at Carrying Value, Beginning Balance 219,180,000 370,474,000 159,956,000
Cash and Cash Equivalents, at Carrying Value, Ending Balance 189,728,000 219,180,000 370,474,000
Supplemental Cash Flow Information [Abstract]      
Interest Paid, Excluding Capitalized Interest, Operating Activities 30,818,000 16,704,000 29,157,000
Income Taxes Paid 24,670,000 25,505,000 24,260,000
Noncash Investing and Financing Items [Abstract]      
Real Estate Owned, Transfer to Real Estate Owned 13,418,000 150,000 1,790,000
Transfer of Portfolio Loans and Leases to Held-for-sale 3,890,000 3,718,000 4,400,000
Other Significant Noncash Transaction, Value of Consideration Received 7,867,000 1,190,000 7,821,000
Affordable Housing Program Obligation, Period Increase (Decrease) 10,000,000 10,000,000 10,000,000
Transfer to Investments 16,250,000 3,000,000 0
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 4,243,000 18,018,000 24,269,000
Consumer Portfolio Segment [Member]      
Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract]      
Increase (Decrease) in Prepaid Expense $ (9,422,000) $ (2,415,000) $ (8,890,000)