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Regulatory Matters - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Detail)
$ in Thousands
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Total Capital (to Risk-Weighted Assets):    
Total Capital (to Risk-Weighted Assets) actual, amount $ 894,343 $ 786,300
Total Capital (to Risk-Weighted Assets) actual, ratio 0.1367 0.1377
Total Capital (to Risk-Weighted Assets) For Capital Adequacy, amount $ 523,498 $ 456,902
Total Capital (to Risk-Weighted Assets) For Capital Adequacy, ratio 0.0800 0.0800
Total Capital (to Risk-Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, amount $ 654,372 $ 571,128
Total Capital (to Risk-Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, ratio 0.1000 0.1000
Tier 1 Capital (to Risk-Weighted Assets):    
Tier 1 Capital (to Risk-Weighted Assets) actual, Amount $ 678,403 $ 633,023
Tier 1 Capital (to Risk-Weighted Assets) Actual, ratio 0.1037 0.1108
Tier 1 Capital (to Risk - Weighed Assets) For Capital Adequacy, amount $ 392,623 $ 342,677
Tier 1 Capital (to Risk - Weighted Assets) For Capital Adequacy, ratio 0.0600 0.0600
Tier 1 Capital (to Risk-Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, amount $ 523,498 $ 456,902
Tier 1 Capital (to Risk-Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, ratio 0.0800 0.0800
Tier 1 Common Capital (to Risk-Weighted Assets)    
Tier One Common Risk Based Capital $ 678,403 $ 633,023
Tier One Common Risk Based Capital To Risk Weighted Assets 10.37% 11.08%
Tier One Common Risk Based Capital Required For Capital Adequacy $ 294,467 $ 257,008
Tier One Common Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets 4.50% 4.50%
Tier One Common Risk Based Capital Required To Be Well Capitalized $ 425,342 $ 371,233
Tier One Common Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets 6.50% 6.50%
Tier 1 Capital (to Average Assets):    
Tier 1 Capital (to Average Assets) actual, amount $ 678,403 $ 633,023
Tier 1 Capital (to Average Assets) actual, ratio 0.0981 0.0913
Tier 1 Capital (to Average Assets) For Capital Adequacy, amount $ 276,586 $ 277,297
Tier 1 Capital (to Average Assets) For Capital Adequacy, ratio 0.0400 0.0400
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, amount $ 345,732 $ 346,622
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, ratio 0.0500 0.0500
Bank [Member]    
Total Capital (to Risk-Weighted Assets):    
Total Capital (to Risk-Weighted Assets) actual, amount $ 740,936 $ 660,436
Total Capital (to Risk-Weighted Assets) actual, ratio 0.1135 0.1161
Total Capital (to Risk-Weighted Assets) For Capital Adequacy, amount $ 522,370 $ 455,178
Total Capital (to Risk-Weighted Assets) For Capital Adequacy, ratio 0.0800 0.0800
Total Capital (to Risk-Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, amount $ 652,962 $ 568,973
Total Capital (to Risk-Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, ratio 0.1000 0.1000
Tier 1 Capital (to Risk-Weighted Assets):    
Tier 1 Capital (to Risk-Weighted Assets) actual, Amount $ 673,256 $ 606,033
Tier 1 Capital (to Risk-Weighted Assets) Actual, ratio 0.1031 0.1065
Tier 1 Capital (to Risk - Weighed Assets) For Capital Adequacy, amount $ 391,777 $ 341,384
Tier 1 Capital (to Risk - Weighted Assets) For Capital Adequacy, ratio 0.0600 0.0600
Tier 1 Capital (to Risk-Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, amount $ 522,370 $ 455,178
Tier 1 Capital (to Risk-Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, ratio 0.0800 0.0800
Tier 1 Common Capital (to Risk-Weighted Assets)    
Tier One Common Risk Based Capital $ 673,256 $ 606,033
Tier One Common Risk Based Capital To Risk Weighted Assets 10.31% 10.65%
Tier One Common Risk Based Capital Required For Capital Adequacy $ 293,833 $ 256,038
Tier One Common Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets 4.50% 4.50%
Tier One Common Risk Based Capital Required To Be Well Capitalized $ 424,426 $ 369,832
Tier One Common Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets 6.50% 6.50%
Tier 1 Capital (to Average Assets):    
Tier 1 Capital (to Average Assets) actual, amount $ 673,256 $ 606,033
Tier 1 Capital (to Average Assets) actual, ratio 0.0976 0.0877
Tier 1 Capital (to Average Assets) For Capital Adequacy, amount $ 276,014 $ 276,471
Tier 1 Capital (to Average Assets) For Capital Adequacy, ratio 0.0400 0.0400
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, amount $ 345,017 $ 345,588
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, ratio 0.0500 0.0500