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Loans and Allowance for Credit Losses - Aging of Past Due Financing Receivables (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | $ 4,882,969 | $ 4,771,988
Nonaccrual Current Loans | $ 24,378 | $ 21,008
Percent of total loans, total loans | 100.00% | 100.00%
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | $ 4,852,879 | $ 4,741,879
Nonaccrual Current Loans | $ 16,737 | $ 7,754
Percent of total loans, accrual | 0.994 | 0.994
Percent of total loans, nonaccrual | 0.30% | 0.20%
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | $ 13,353 | $ 22,355
Percent of total loans, total past due | 0.30% | 0.50%
30‑59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | $ 5,017 | $ 8,314
Percent of total loans, total past due | 0.10% | 0.20%
60‑89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | $ 542 | $ 493
Percent of total loans, total past due | 0.00% | 0.00%
90 Days Past Due and Still Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | $ 153 | $ 294
Percent of total loans, total past due | 0.00% | 0.00%
30-89 Days Past Due and Not Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | $ 4,404 | $ 4,163
Percent of total loans, total past due | 0.10% | 0.10%
90 Days Past Due and Not Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | $ 3,237 | $ 9,091
Percent of total loans, total past due | 0.10% | 0.20%
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | $ 2,642,601 | $ 2,557,806
Nonaccrual Current Loans | 10,162 | 10,386
Commercial real estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 2,630,845 | 2,547,345
Nonaccrual Current Loans | 7,171 | 3,118
Commercial real estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 4,585 | 7,343
Commercial real estate | 30‑59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 1,594 | 75
Commercial real estate | 60‑89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 0 | 0
Commercial real estate | 90 Days Past Due and Still Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 0 | 0
Commercial real estate | 30-89 Days Past Due and Not Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 2,512 | 2,328
Commercial real estate | 90 Days Past Due and Not Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 479 | 4,940
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 1,383,348 | 1,329,406
Nonaccrual Current Loans | 9,909 | 7,614
Residential real estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 1,370,925 | 1,317,591
Nonaccrual Current Loans | 5,513 | 3,635
Residential real estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 6,910 | 8,180
Residential real estate | 30‑59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 1,972 | 3,828
Residential real estate | 60‑89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 414 | 246
Residential real estate | 90 Days Past Due and Still Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 128 | 127
Residential real estate | 30-89 Days Past Due and Not Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 1,869 | 655
Residential real estate | 90 Days Past Due and Not Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 2,527 | 3,324
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 352,116 | 335,999
Nonaccrual Current Loans | 52 | 360
Construction | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 351,982 | 335,609
Nonaccrual Current Loans | 0 | 0
Construction | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 134 | 390
Construction | 30‑59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 82 | 30
Construction | 60‑89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 0 | 0
Construction | 90 Days Past Due and Still Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 0 | 0
Construction | 30-89 Days Past Due and Not Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 0 | 0
Construction | 90 Days Past Due and Not Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 52 | 360
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 221,598 | 237,932
Nonaccrual Current Loans | 3,689 | 1,007
Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 217,900 | 236,771
Nonaccrual Current Loans | 3,517 | 937
Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 181 | 224
Commercial | 30‑59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 9 | 152
Commercial | 60‑89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 0 | 2
Commercial | 90 Days Past Due and Still Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 0 | 0
Commercial | 30-89 Days Past Due and Not Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 8 | 0
Commercial | 90 Days Past Due and Not Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 164 | 70
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 278,242 | 303,746
Nonaccrual Current Loans | 518 | 1,473
Consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 276,264 | 298,150
Nonaccrual Current Loans | 488 | 42
Consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 1,490 | 5,554
Consumer | 30‑59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 1,356 | 4,068
Consumer | 60‑89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 103 | 55
Consumer | 90 Days Past Due and Still Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 1 | 0
Consumer | 30-89 Days Past Due and Not Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 15 | 1,180
Consumer | 90 Days Past Due and Not Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 15 | 251
Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 5,064 | 7,099
Nonaccrual Current Loans | 48 | 168
Credit cards | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 4,963 | 6,413
Nonaccrual Current Loans | 48 | 22
Credit cards | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 53 | 664
Credit cards | 30‑59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 4 | 161
Credit cards | 60‑89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 25 | 190
Credit cards | 90 Days Past Due and Still Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 24 | 167
Credit cards | 30-89 Days Past Due and Not Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | 0 | 0
Credit cards | 90 Days Past Due and Not Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Current Accrual Loans | $ 0 | $ 146

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