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Loans Receivable - Summary of Allowance for Loan Losses On Loans Receivables (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Allowance for loan losses: |  |  |  |  |
Beginning balance | $ 17,970 | $ 16,666 | $ 16,461 | $ 16,620 |
CECL adoption |  |  | (301) |  |
CECL day 1 provision |  |  | 1,707 |  |
Purchased credit deteriorated loans |  |  | 601 |  |
Provision | 0 | 200 | 1,340 | 200 |
Charge-offs | 0 | (200) | (1,868) | (400) |
Recoveries | 22 | 0 | 52 | 246 |
Total | 17,992 | 16,666 | 17,992 | 16,666 |
Individually evaluated for impairment | 0 |  | 0 |  | $ 118
Collectively evaluated for impairment | 17,992 |  | 17,992 |  | 16,343
Loans: |  |  |  |  |
Individually evaluated for impairment | 9,753 |  | 9,753 |  | 12,377
Collectively evaluated for impairment | 1,491,058 |  | 1,491,058 |  | 1,360,447
Ending balance | 1,500,811 |  | 1,500,811 |  | 1,372,824
Commercial real estate [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 12,123 | 8,683 | 8,654 | 7,458 |
CECL adoption |  |  | 1,384 |  |
CECL day 1 provision |  |  | 1,586 |  |
Purchased credit deteriorated loans |  |  | 499 |  |
Provision | 3,301 | 413 | 4,994 | 1,592 |
Charge-offs | 0 | (200) | (1,718) | (400) |
Recoveries | 4 | 0 | 29 | 246 |
Total | 15,428 | 8,896 | 15,428 | 8,896 |
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 15,428 |  | 15,428 |  | 8,654
Loans: |  |  |  |  |
Individually evaluated for impairment | 4,485 |  | 4,485 |  | 12,030
Collectively evaluated for impairment | 1,075,803 |  | 1,075,803 |  | 861,543
Ending balance | 1,080,288 |  | 1,080,288 |  | 873,573
Commercial and industrial [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 407 | 279 | 271 | 713 |
CECL adoption |  |  | (73) |  |
CECL day 1 provision |  |  | 105 |  |
Purchased credit deteriorated loans |  |  | 102 |  |
Provision | (81) | 11 | (84) | (423) |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 18 | 0 | 23 | 0 |
Total | 344 | 290 | 344 | 290 |
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 344 |  | 344 |  | 271
Loans: |  |  |  |  |
Individually evaluated for impairment | 2,232 |  | 2,232 |  | 10
Collectively evaluated for impairment | 49,925 |  | 49,925 |  | 28,849
Ending balance | 52,157 |  | 52,157 |  | 28,859
Construction [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 4,529 | 6,430 | 6,289 | 7,228 |
CECL adoption |  |  | (1,269) |  |
CECL day 1 provision |  |  | 0 |  |
Purchased credit deteriorated loans |  |  | 0 |  |
Provision | (3,219) | (304) | (3,562) | (1,102) |
Charge-offs | 0 | 0 | (148) | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Total | 1,310 | 6,126 | 1,310 | 6,126 |
Individually evaluated for impairment | 0 |  | 0 |  | 118
Collectively evaluated for impairment | 1,310 |  | 1,310 |  | 6,171
Loans: |  |  |  |  |
Individually evaluated for impairment | 2,925 |  | 2,925 |  | 148
Collectively evaluated for impairment | 317,899 |  | 317,899 |  | 417,390
Ending balance | 320,824 |  | 320,824 |  | 417,538
Residential first-lien mortgage [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 661 | 259 | 236 | 267 |
CECL adoption |  |  | 428 |  |
CECL day 1 provision |  |  | 16 |  |
Purchased credit deteriorated loans |  |  | 0 |  |
Provision | 160 | (8) | 143 | (16) |
Charge-offs | 0 | 0 | (2) | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Total | 821 | 251 | 821 | 251 |
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 821 |  | 821 |  | 236
Loans: |  |  |  |  |
Individually evaluated for impairment | 111 |  | 111 |  | 118
Collectively evaluated for impairment | 39,571 |  | 39,571 |  | 43,007
Ending balance | 39,682 |  | 39,682 |  | 43,125
Home equity/consumer [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 250 | 50 | 45 | 48 |
CECL adoption |  |  | 195 |  |
CECL day 1 provision |  |  | 0 |  |
Purchased credit deteriorated loans |  |  | 0 |  |
Provision | (161) | (5) | (151) | (3) |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Total | 89 | 45 | 89 | 45 |
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 89 |  | 89 |  | 45
Loans: |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  | 71
Collectively evaluated for impairment | 7,860 |  | 7,860 |  | 9,658
Ending balance | 7,860 |  | 7,860 |  | 9,729
Unallocated [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Beginning balance | 0 | 965 | 966 | 906 |
CECL adoption |  |  | (966) |  |
CECL day 1 provision |  |  | 0 |  |
Purchased credit deteriorated loans |  |  | 0 |  |
Provision | 0 | 93 | 0 | 152 |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Total | 0 | $ 1,058 | 0 | $ 1,058 |
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 0 |  | 0 |  | 966
Loans: |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  | 0
Collectively evaluated for impairment | 0 |  | 0 |  | 0
Ending balance | $ 0 |  | $ 0 |  | $ 0

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