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Loans - Residential, Home Equity and Consumer Loans Based on Payment Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total | $ 3,978,919 |  | $ 3,977,900
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Total | 1,061 | $ 1,238 |
Consumer Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 11,092 |  | 49,282
Year two | 43,922 |  | 21,480
Year three | 18,492 |  | 9,720
Year four | 8,005 |  | 2,756
Year five | 2,400 |  | 917
Prior | 2,380 |  | 1,912
Revolving Loans Amortized Cost Basis | 1,717 |  | 1,786
Total | 88,008 |  | 87,853
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Year one | 248 |  | 1,162
Year two | 75 |  | 42
Year three | 27 |  | 23
Year four | 15 |  | 71
Year five | 0 |  | 3
Prior | 0 |  | 1
Revolving Loans Amortized Cost Basis | 3 |  | 7
Total | 368 | 345 | 1,309
Consumer Loans | Performing |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 11,092 |  | 49,208
Year two | 43,898 |  | 21,459
Year three | 18,463 |  | 9,708
Year four | 7,984 |  | 2,756
Year five | 2,400 |  | 917
Prior | 2,377 |  | 1,911
Revolving Loans Amortized Cost Basis | 1,717 |  | 1,783
Total | 87,931 |  | 87,742
Consumer Loans | Nonperforming |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 0 |  | 74
Year two | 24 |  | 21
Year three | 29 |  | 12
Year four | 21 |  | 0
Year five | 0 |  | 0
Prior | 3 |  | 1
Revolving Loans Amortized Cost Basis | 0 |  | 3
Total | 77 |  | 111
Home Equity Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 0 |  | 0
Year two | 238 |  | 417
Year three | 1,903 |  | 488
Year four | 303 |  | 150
Year five | 236 |  | 165
Prior | 3,536 |  | 1,309
Revolving Loans Amortized Cost Basis | 306,643 |  | 297,156
Total | 312,859 |  | 299,685
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Year one | 0 |  | 0
Year two | 0 |  | 0
Year three | 35 |  | 0
Year four | 99 |  | 55
Year five | 0 |  | 0
Prior | 0 |  | 24
Revolving Loans Amortized Cost Basis | 0 |  | 15
Total | 134 | 14 | 94
Home Equity Loans | Performing |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 0 |  | 0
Year two | 238 |  | 170
Year three | 1,691 |  | 236
Year four | 303 |  | 90
Year five | 236 |  | 165
Prior | 3,255 |  | 1,207
Revolving Loans Amortized Cost Basis | 306,632 |  | 296,784
Total | 312,355 |  | 298,652
Home Equity Loans | Nonperforming |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 0 |  | 0
Year two | 0 |  | 247
Year three | 212 |  | 252
Year four | 0 |  | 60
Year five | 0 |  | 0
Prior | 281 |  | 102
Revolving Loans Amortized Cost Basis | 11 |  | 372
Total | 504 |  | 1,033
Residential Mortgage Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 12,231 |  | 56,317
Year two | 55,043 |  | 65,361
Year three | 64,121 |  | 86,170
Year four | 82,977 |  | 41,639
Year five | 40,223 |  | 17,940
Prior | 106,641 |  | 95,417
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 361,236 |  | 362,844
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Year one | 0 |  | 0
Year two | 0 |  | 0
Year three | 0 |  | 22
Year four | 0 |  | 36
Year five | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 0 | $ 26 | 58
Residential Mortgage Loans | Performing |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 12,231 |  | 56,306
Year two | 54,893 |  | 65,301
Year three | 64,121 |  | 85,753
Year four | 82,933 |  | 41,352
Year five | 40,025 |  | 17,831
Prior | 105,460 |  | 94,926
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 359,663 |  | 361,469
Residential Mortgage Loans | Nonperforming |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 0 |  | 11
Year two | 150 |  | 60
Year three | 0 |  | 417
Year four | 44 |  | 287
Year five | 198 |  | 109
Prior | 1,181 |  | 491
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | $ 1,573 |  | $ 1,375

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