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Regulatory Matters - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Detail)
$ in Thousands
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Total Capital (to Risk-Weighted Assets):    
Total Capital (to Risk-Weighted Assets) actual, amount $ 786,300 $ 801,368
Total Capital (to Risk-Weighted Assets) actual, ratio 0.1377 0.1531
Total Capital (to Risk-Weighted Assets) For Capital Adequacy, amount $ 456,902 $ 418,811
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 $ 571,128 $ 523,513
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 $ 633,023 $ 563,491
Tier 1 Capital (to Risk-Weighted Assets) Actual, ratio 0.1108 0.1076
Tier 1 Capital (to Risk - Weighed Assets) For Capital Adequacy, amount $ 342,677 $ 314,108
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 $ 456,902 $ 418,811
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 $ 633,023 $ 563,491
Tier One Common Risk Based Capital To Risk Weighted Assets 11.08% 10.76%
Tier One Common Risk Based Capital Required For Capital Adequacy $ 257,008 $ 235,581
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 $ 371,233 $ 340,284
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 $ 633,023 $ 563,491
Tier 1 Capital (to Average Assets) actual, ratio 0.0913 0.0908
Tier 1 Capital (to Average Assets) For Capital Adequacy, amount $ 277,297 $ 248,224
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 $ 346,622 $ 310,280
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 $ 660,436 $ 632,183
Total Capital (to Risk-Weighted Assets) actual, ratio 0.1161 0.1212
Total Capital (to Risk-Weighted Assets) For Capital Adequacy, amount $ 455,178 $ 417,416
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 $ 568,973 $ 521,769
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 $ 606,033 $ 569,821
Tier 1 Capital (to Risk-Weighted Assets) Actual, ratio 0.1065 0.1092
Tier 1 Capital (to Risk - Weighed Assets) For Capital Adequacy, amount $ 341,384 $ 313,062
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 $ 455,178 $ 417,416
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 $ 606,033 $ 569,821
Tier One Common Risk Based Capital To Risk Weighted Assets 10.65% 10.92%
Tier One Common Risk Based Capital Required For Capital Adequacy $ 256,038 $ 234,796
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 $ 369,832 $ 339,150
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 $ 606,033 $ 569,821
Tier 1 Capital (to Average Assets) actual, ratio 0.0877 0.0921
Tier 1 Capital (to Average Assets) For Capital Adequacy, amount $ 276,471 $ 247,494
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 $ 345,588 $ 309,368
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions, ratio 0.0500 0.0500