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Regulatory Matters - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Detail)
$ in Thousands
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Total Capital (to Risk-Weighted Assets):    
Total Capital (to Risk-Weighted Assets) actual, amount $ 953,889 $ 894,343
Total Capital (to Risk-Weighted Assets) actual, ratio 0.1390 0.1367
Total Capital (to Risk-Weighted Assets) For Capital Adequacy, amount $ 549,160 $ 523,498
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 $ 686,450 $ 654,372
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 $ 726,478 $ 678,403
Tier 1 Capital (to Risk-Weighted Assets) Actual, ratio 0.1058 0.1037
Tier 1 Capital (to Risk - Weighed Assets) For Capital Adequacy, amount $ 411,870 $ 392,623
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 $ 549,160 $ 523,498
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 $ 726,478 $ 678,403
Tier One Common Risk Based Capital To Risk Weighted Assets 10.58% 10.37%
Tier One Common Risk Based Capital Required For Capital Adequacy $ 308,903 $ 294,467
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 $ 446,193 $ 425,342
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 $ 726,478 $ 678,403
Tier 1 Capital (to Average Assets) actual, ratio 0.0936 0.0981
Tier 1 Capital (to Average Assets) For Capital Adequacy, amount $ 310,520 $ 276,586
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 $ 388,150 $ 345,732
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 $ 810,449 $ 740,936
Total Capital (to Risk-Weighted Assets) actual, ratio 0.1186 0.1135
Total Capital (to Risk-Weighted Assets) For Capital Adequacy, amount $ 546,782 $ 522,370
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 $ 683,478 $ 652,962
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 $ 731,799 $ 673,256
Tier 1 Capital (to Risk-Weighted Assets) Actual, ratio 0.1071 0.1031
Tier 1 Capital (to Risk - Weighed Assets) For Capital Adequacy, amount $ 410,087 $ 391,777
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 $ 546,782 $ 522,370
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 $ 731,799 $ 673,256
Tier One Common Risk Based Capital To Risk Weighted Assets 10.71% 10.31%
Tier One Common Risk Based Capital Required For Capital Adequacy $ 307,565 $ 293,833
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 $ 444,260 $ 424,426
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 $ 731,799 $ 673,256
Tier 1 Capital (to Average Assets) actual, ratio 0.0945 0.0976
Tier 1 Capital (to Average Assets) For Capital Adequacy, amount $ 309,753 $ 276,014
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 $ 387,191 $ 345,017
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, ratio 0.0500 0.0500