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Loans and the Allowance for Credit Losses - Summary of Nonperforming Loans (Detail) - Nonperforming Loans [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance, With no specific allowance recorded | $ 50,951 | $ 49,794 |
Recorded Investment, With no specific allowance recorded | 41,415 | 39,488 |
Total impaired loans, Unpaid principal balance | 50,951 | 49,794 |
Total impaired loans, Recorded investment | 41,415 | 39,488 |
Average recorded investment, with no related specific allowance | 37,213 | 38,413 | $ 38,854
Interest income recognized, With no related specific allowance | 402 | 214 | 260
Average recorded investment, With a specific allowance recorded |  | 1,669 | 3,740
Total impaired loans, Average recorded investment | 37,213 | 40,082 | 42,594
Total impaired loans, Interest income recognized | 402 | 214 | 260
Residential Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 21,084 | 25,492 |
Recorded Investment, With no specific allowance recorded | 16,057 | 20,065 |
Average recorded investment, with no related specific allowance | 17,873 | 20,971 | 19,651
Interest income recognized, With no related specific allowance | 247 | 155 | 168
Average recorded investment, With a specific allowance recorded |  |  | 878
Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 316 | 869 |
Recorded Investment, With no specific allowance recorded | 159 | 565 |
Average recorded investment, with no related specific allowance | 406 | 420 | 377
Interest income recognized, With no related specific allowance | 5 | 3 | 2
Average recorded investment, With a specific allowance recorded |  |  | 11
Home Equity [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 6,970 | 6,985 |
Recorded Investment, With no specific allowance recorded | 5,374 | 5,440 |
Average recorded investment, with no related specific allowance | 5,298 | 5,561 | 5,806
Interest income recognized, With no related specific allowance | 37 | 13 | 22
Average recorded investment, With a specific allowance recorded |  |  | 141
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 112 | 74 |
Recorded Investment, With no specific allowance recorded | 112 | 73 |
Average recorded investment, with no related specific allowance | 79 | 176 | 571
Interest income recognized, With no related specific allowance | 2 |  |
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 18,367 | 9,846 |
Recorded Investment, With no specific allowance recorded | 16,601 | 8,089 |
Average recorded investment, with no related specific allowance | 9,324 | 7,207 | 7,193
Interest income recognized, With no related specific allowance | 99 | 32 | 61
Average recorded investment, With a specific allowance recorded |  | 1,669 | 2,672
Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance, With no specific allowance recorded | 4,102 | 6,528 |
Recorded Investment, With no specific allowance recorded | 3,112 | 5,256 |
Average recorded investment, with no related specific allowance | 4,233 | 4,077 | 5,256
Interest income recognized, With no related specific allowance | $ 12 | $ 11 | 7
Average recorded investment, With a specific allowance recorded |  |  | $ 38

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