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Loans Receivable - Composition of Impaired Loans by Portfolio Segment and Class of Financing Receivable (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Composition of impaired loans by portfolio segment and by class of financing receivable    
Nonaccrual loans at beginning balance $ 94,384,000 $ 81,236,000
Nonaccrual loans with an allowance 71,125,000 68,835,000
Nonaccrual loans with no allowance 23,935,000 25,549,000
Nonaccrual loans at ending balance 95,060,000 94,384,000
Loans 90 days past due and accruing 2,452,000 2,698,000
Interest income, accrual method 0 0
Amortized cost basis of collateral-dependent loans 67,989,000 67,084,000
Real estate    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Amortized cost basis of collateral-dependent loans 66,733,000 67,084,000
Equipment    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Amortized cost basis of collateral-dependent loans 1,256,000  
Personal Banking    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Nonaccrual loans at beginning balance 18,264,000 15,746,000
Nonaccrual loans with an allowance 14,707,000 16,804,000
Nonaccrual loans with no allowance 1,440,000 1,460,000
Nonaccrual loans at ending balance 16,147,000 18,264,000
Loans 90 days past due and accruing 2,196,000 2,463,000
Personal Banking | Residential mortgage loans    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Nonaccrual loans at beginning balance 8,727,000 7,574,000
Nonaccrual loans with an allowance 6,703,000 8,304,000
Nonaccrual loans with no allowance 406,000 423,000
Nonaccrual loans at ending balance 7,109,000 8,727,000
Loans 90 days past due and accruing 1,509,000 1,671,000
Personal Banking | Home equity loans    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Nonaccrual loans at beginning balance 4,492,000 4,145,000
Nonaccrual loans with an allowance 4,254,000 4,084,000
Nonaccrual loans with no allowance 155,000 408,000
Nonaccrual loans at ending balance 4,409,000 4,492,000
Loans 90 days past due and accruing 1,000 26,000
Personal Banking | Vehicle loans    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Nonaccrual loans at beginning balance 4,816,000 3,771,000
Nonaccrual loans with an allowance 3,481,000 4,187,000
Nonaccrual loans with no allowance 879,000 629,000
Nonaccrual loans at ending balance 4,360,000 4,816,000
Loans 90 days past due and accruing 59,000 44,000
Personal Banking | Consumer loans    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Nonaccrual loans at beginning balance 229,000 256,000
Nonaccrual loans with an allowance 269,000 229,000
Nonaccrual loans with no allowance 0 0
Nonaccrual loans at ending balance 269,000 229,000
Loans 90 days past due and accruing 627,000 722,000
Commercial Banking    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Nonaccrual loans at beginning balance 76,120,000 65,490,000
Nonaccrual loans with an allowance 56,418,000 52,031,000
Nonaccrual loans with no allowance 22,495,000 24,089,000
Nonaccrual loans at ending balance 78,913,000 76,120,000
Loans 90 days past due and accruing 256,000 235,000
Amortized cost basis of collateral-dependent loans 67,989,000 67,084,000
Commercial Banking | Real estate    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Amortized cost basis of collateral-dependent loans 66,733,000 67,084,000
Commercial Banking | Equipment    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Amortized cost basis of collateral-dependent loans 1,256,000  
Commercial Banking | Commercial real estate loans    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Nonaccrual loans at beginning balance 71,297,000 62,239,000
Nonaccrual loans with an allowance 50,794,000 47,359,000
Nonaccrual loans with no allowance 22,339,000 23,938,000
Nonaccrual loans at ending balance 73,133,000 71,297,000
Loans 90 days past due and accruing 0 225,000
Amortized cost basis of collateral-dependent loans 67,843,000 66,934,000
Commercial Banking | Commercial real estate loans | Real estate    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Amortized cost basis of collateral-dependent loans 66,587,000 66,934,000
Commercial Banking | Commercial real estate loans | Equipment    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Amortized cost basis of collateral-dependent loans 1,256,000  
Commercial Banking | Commercial real estate loans - owner occupied    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Nonaccrual loans at beginning balance 676,000 624,000
Nonaccrual loans with an allowance 1,319,000 676,000
Nonaccrual loans with no allowance 0 0
Nonaccrual loans at ending balance 1,319,000 676,000
Loans 90 days past due and accruing 0 0
Commercial Banking | Commercial loans    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Nonaccrual loans at beginning balance 4,147,000 2,627,000
Nonaccrual loans with an allowance 4,305,000 3,996,000
Nonaccrual loans with no allowance 156,000 151,000
Nonaccrual loans at ending balance 4,461,000 4,147,000
Loans 90 days past due and accruing 256,000 10,000
Amortized cost basis of collateral-dependent loans 146,000 150,000
Commercial Banking | Commercial loans | Real estate    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Amortized cost basis of collateral-dependent loans 146,000 $ 150,000
Commercial Banking | Commercial loans | Equipment    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Amortized cost basis of collateral-dependent loans $ 0