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Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | $ 3,118 | $ 9,274 |  |
Allowance for loans collectively evaluated for impairment | 114,672 | 112,348 |  |
Allowance for loan commitments | 8,368 | 7,775 | $ 9,514 | $ 874
Total allowance for credit losses - loans and commitments | 126,158 | 129,397 | 195,341 | 53,303
Individually evaluated for credit loss | 50,399 | 68,459 |  |
Collectively-evaluated for credit losses | 10,652,329 | 9,665,019 |  |
Total loans | 10,702,728 | 9,733,478 |  |
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | 130 | 333 |  |
Allowance for loans collectively evaluated for impairment | 31,410 | 26,542 |  |
Allowance for loan commitments |  | 1,497 | 1,275 | 311
Total allowance for credit losses - loans and commitments | 31,540 | 28,372 | 39,125 | 14,427
Individually evaluated for credit loss | 401 | 576 |  |
Collectively-evaluated for credit losses | 1,578,994 | 1,589,744 |  |
Total loans | 1,579,395 | 1,590,320 |  |
Deposit Overdraft [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 1,285 | 2,220 |  |
Total allowance for credit losses - loans and commitments | 1,285 | 2,220 | 639 | 1,387
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 6,061,344 | 5,538,968 |  |
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment |  | 381 |  |
Allowance for loans collectively evaluated for impairment | 6,737 | 6,929 |  |
Allowance for loan commitments | 6,025 | 4,180 | 6,508 | 235
Total allowance for credit losses - loans and commitments | 12,762 | 11,490 | 17,349 | 5,184
Individually evaluated for credit loss | 24,629 | 1,248 |  |
Collectively-evaluated for credit losses | 919,258 | 832,632 |  |
Total loans | 943,887 | 833,880 |  |
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | 2,988 | 8,560 |  |
Allowance for loans collectively evaluated for impairment | 49,671 | 56,795 |  |
Allowance for loan commitments |  | 201 | 712 | 22
Total allowance for credit losses - loans and commitments | 52,659 | 65,556 | 111,364 | 20,315
Individually evaluated for credit loss | 25,369 | 66,635 |  |
Collectively-evaluated for credit losses | 5,092,088 | 4,638,453 |  |
Total loans | 5,117,457 | 4,705,088 |  |
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 18,208 | 15,401 |  |
Allowance for loan commitments | 2,215 | 1,576 | 955 | 15
Total allowance for credit losses - loans and commitments | 20,423 | 16,977 | 18,806 | 4,326
Collectively-evaluated for credit losses | 2,140,584 | 1,721,378 |  |
Total loans | 2,140,584 | 1,721,378 |  |
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 3,127 | 3,737 |  |
Allowance for loan commitments |  | 272 | 19 | 41
Total allowance for credit losses - loans and commitments | 3,127 | 4,009 | 6,526 | 2,992
Collectively-evaluated for credit losses | 226,340 | 277,130 |  |
Total loans | 226,340 | 277,130 |  |
Home Equity [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 4,234 | 724 |  |
Allowance for loan commitments | 128 | 49 | 45 | 250
Total allowance for credit losses - loans and commitments | 4,362 | 773 | $ 1,532 | $ 4,672
Collectively-evaluated for credit losses | 695,065 | 605,682 |  |
Total loans | $ 695,065 | $ 605,682 |  |

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