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Loans and Allowance for Credit Losses - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) loan borrower | Sep. 30, 2024 USD ($) loan borrower | Sep. 30, 2025 USD ($) loan Category borrower note category | Sep. 30, 2024 USD ($) borrower loan | Dec. 31, 2024 USD ($) | Sep. 30, 2025 loan_relationship | Sep. 30, 2025 mortgage | Sep. 30, 2025 loan | Sep. 30, 2025 | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Number of national credit relationships | loan_relationship |  |  |  |  |  | 4,000,000 |  |  |  |  |  |
Outstanding balance | $ 2,236,064 |  | $ 2,236,064 |  | $ 2,080,468 |  |  |  |  |  |  |
Allowance for credit losses | 23,322 | $ 21,499 | 23,322 | $ 21,499 | 19,663 |  |  |  |  | $ 20,785 | $ 22,084 | $ 22,124
Foreclosed properties held | 600 |  | 600 |  |  |  |  |  |  |  |  |
Asset acquisition, consideration transferred |  |  | $ 500 |  |  |  |  |  |  |  |  |
Number of points in internal risk rating system | category |  |  | 9 |  |  |  |  |  |  |  |  |
Number of categories in internal risk rating system considered as not criticized | Category |  |  | 5 |  |  |  |  |  |  |  |  |
Commercial relationship credit review threshold amount | 1,000 |  | $ 1,000 |  |  |  |  |  |  |  |  |
Liability for unfunded commitments | 1,800 |  | 1,800 |  | 1,600 |  |  |  |  |  |  |
Accrued interest, write off | $ 967 | 1,392 | $ 2,981 | 5,080 | 7,756 |  |  |  |  |  |  |
Number of loans modified in period | loan | 4 |  | 8 |  |  |  |  |  |  |  |  |
Unfunded commitments | $ 4,427 | $ 959 | $ 6,594 | $ 3,210 |  |  |  |  |  |  |  |
Number of borrowers with modified loans | borrower | 4 | 1 | 8 | 17 |  |  |  |  |  |  |  |
Total | $ 1,900 |  |  |  |  |  |  |  |  |  |  |
Total | 2,027 | $ 475 | $ 21,622 | $ 5,808 |  |  |  |  |  |  |  |
Total Past Due |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Total | 1,328 |  | 4,758 | 5,135 |  |  |  |  |  |  |  |
Accrued interest modified | $ 4,800 |  | $ 4,800 |  |  |  |  |  |  |  |  |
Payment Delay |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Number of loans modified in period | loan | 1,000,000 |  | 2 |  |  |  |  |  |  |  |  |
Number of borrowers with modified loans | borrower | 1 |  | 2 |  |  |  |  |  |  |  |  |
Total | $ 100 |  | $ 1,000 |  |  |  |  |  |  |  |  |
Total | 1,920 | 0 | 8,045 | 5,333 |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Percentage of commercial outstanding loan balances |  |  |  |  |  |  |  |  | 35.00% |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Percentage of commercial outstanding loan balances |  |  |  |  |  |  |  |  | 40.00% |  |  |
Total commercial |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses | 13,967 | 12,863 | 13,967 | 12,863 | 10,838 |  |  |  |  | 12,633 | 13,482 | 12,536
Number foreclosed properties sold |  |  |  |  |  |  | 1 | 1,000,000 |  |  |  |
Investment in loans in the process of foreclosure | 100 |  | 100 |  |  |  |  |  |  |  |  |
Accrued interest, write off | 546 | 415 | 1,598 | 2,292 |  |  |  |  |  |  |  |
Total | 2,027 | 475 | 21,622 | 5,808 |  |  |  |  |  |  |  |
Total commercial | Total Past Due |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Total | 1,328 |  | 4,758 | 5,135 |  |  |  |  |  |  |  |
Total commercial | Payment Delay |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Total | 1,920 | 0 | 8,045 | 5,333 |  |  |  |  |  |  |  |
Total commercial | Payment Delay | Residential Real Estate |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Total |  |  | 1,300 |  |  |  |  |  |  |  |  |
Residential real estate |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses | 8,210 | 7,087 | 8,210 | 7,087 | 7,322 |  |  |  |  | 6,955 | 6,248 | 6,412
Number foreclosed properties sold | mortgage |  |  |  |  |  |  | 1,000,000 |  |  |  |  |
Investment in loans in the process of foreclosure | 400 |  | 400 |  |  |  |  |  |  |  |  |
Accrued interest, write off | 0 | 0 | 0 | 0 | 11 |  |  |  |  |  |  |
Total | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |
Residential real estate | Total Past Due |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Total | 0 |  | 0 | 0 |  |  |  |  |  |  |  |
Residential real estate | Payment Delay |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Total | 0 | 0 |  | 0 |  |  |  |  |  |  |  |
Consumer |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses | 1,047 | 1,458 | 1,047 | 1,458 | 1,408 |  |  |  |  | 1,110 | 2,269 | 3,079
Accrued interest, write off | 421 | 977 | 1,383 | 2,788 | 3,366 |  |  |  |  |  |  |
Total | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |
Consumer | Total Past Due |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Total | 0 |  | 0 | 0 |  |  |  |  |  |  |  |
Consumer | Payment Delay |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Total | 0 | 0 |  | 0 |  |  |  |  |  |  |  |
National Credit Relationships |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance | 89,800 |  | 89,800 |  |  |  |  |  |  |  |  |
Allowance for credit losses | 61,200 |  | 61,200 |  |  |  |  |  |  |  |  |
Subprime Consumer Automotive Segment | Total commercial |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest, write off | $ 600 |  | $ 1,600 |  |  |  |  |  |  |  |  |
Number of loans modified in period | loan | 2 |  | 10 |  |  |  |  |  |  |  |  |
Subprime Consumer Automotive Segment | Consumer |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest, write off | $ 400 |  | $ 1,400 |  |  |  |  |  |  |  |  |
Unfunded Commitments |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Unfunded commitments | 200 | 300 | $ 200 | 500 |  |  |  |  |  |  |  |
Business | Payment Delay | Government-Guaranteed Collateral |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Number of loans modified in period | loan |  |  | 8 |  |  |  |  |  |  |  |  |
Business | Total commercial |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses | 9,222 | 8,415 | $ 9,222 | 8,415 | 6,495 |  |  |  |  | $ 7,704 | $ 9,573 | $ 7,931
Accrued interest, write off | 546 | 415 | 1,598 | 2,292 | $ 4,379 |  |  |  |  |  |  |
Total | 2,027 | 475 | 8,152 | 5,808 |  |  |  |  |  |  |  |
Accrued interest modified | 2,500 | $ 2,300 | $ 2,500 | $ 2,300 |  |  |  |  |  |  |  |
Number of modified loans that has defaulted | loan |  |  | 1 | 3 |  |  |  |  |  |  |  |
Business | Total commercial | Total Past Due |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Total | 1,328 |  | $ 4,758 | $ 5,135 |  |  |  |  |  |  |  |
Number of past due modified loans | loan |  | 0 |  | 0 |  |  |  | 3 |  |  |  |
Business | Total commercial | Government-Guaranteed Collateral |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Total |  |  | 5,500 |  |  |  |  |  |  |  |  |
Number of modified loans that has defaulted | loan |  |  |  | 3 |  |  |  |  |  |  |  |
Business | Total commercial | Government-Guaranteed Collateral | Total Past Due |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Number of past due modified loans | loan |  |  |  |  |  |  |  | 2 |  |  |  |
Accrued interest modified | 600 |  | $ 600 |  |  |  |  |  |  |  |  |
Business | Total commercial | Accounts Receivable |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Number of loans modified in period | note |  |  | 1 |  |  |  |  |  |  |  |  |
Business | Total commercial | Residential Real Estate | Total Past Due |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Number of past due modified loans | loan |  |  |  |  |  |  |  | 1 |  |  |  |
Business | Total commercial | Payment Delay |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Total | $ 1,920 | $ 0 | $ 8,045 | $ 5,333 |  |  |  |  |  |  |  |
Business | Total commercial | Payment Delay | Government-Guaranteed Collateral |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Number of loans modified in period | loan |  |  | 7 |  |  |  |  |  |  |  |  |
Business | Total commercial | Payment Delay | Accounts Receivable |  |  |  |  |  |  |  |  |  |  |  |
Activity in the allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |
Total |  |  | $ 2,500 |  |  |  |  |  |  |  |  |

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