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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 427,616 $ 384,800
Total capital (to risk-weighted assets), Actual, Ratio 13.39% 12.91%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 255,419 $ 238,543
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio 8.00% 8.00%
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 315,283 $ 275,816
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 9.875% 9.25%
Tier 1 capital (to average assets), Actual, Amount $ 409,760 $ 368,355
Tier 1 capital (to average assets), Actual, Ratio 12.83% 12.35%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 191,565 $ 178,907
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 6.00% 6.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 251,429 $ 216,180
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 7.875% 7.25%
Common equity tier 1 capital, Actual Amount $ 371,297 $ 329,892
Common equity tier 1 capital, Actual Ratio 11.63% 11.06%
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 143,673 $ 134,181
Common equity tier 1 capital, For capital adequacy purpose, Ratio 4.50% 4.50%
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 203,537 $ 171,454
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 6.375% 5.75%
Tier 1 capital (to average assets), Actual, Amount $ 409,760 $ 368,355
Tier 1 capital (to average assets), Actual, Ratio 10.12% 9.92%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 162,033 $ 148,503
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 4.00% 4.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 162,033 $ 148,503
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 4.00% 4.00%
Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 396,755 $ 382,788
Total capital (to risk-weighted assets), Actual, Ratio 12.43% 12.85%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 255,419 $ 238,386
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio 8.00% 8.00%
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 315,283 $ 275,634
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 9.875% 9.25%
Total capital (to risk-weighted assets), For well capitalized purpose, Amount $ 319,274 $ 297,982
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio 10.00% 10.00%
Tier 1 capital (to average assets), Actual, Amount $ 378,899 $ 366,343
Tier 1 capital (to average assets), Actual, Ratio 11.87% 12.29%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 191,565 $ 178,790
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 6.00% 6.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 251,429 $ 216,038
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 7.875% 7.25%
Tier 1 capital (to average assets), For well capitalized purpose, Amount $ 255,420 $ 238,386
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 8.00% 8.00%
Common equity tier 1 capital, Actual Amount $ 378,899 $ 366,343
Common equity tier 1 capital, Actual Ratio 11.87% 12.29%
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 143,674 $ 134,092
Common equity tier 1 capital, For capital adequacy purpose, Ratio 4.50% 4.50%
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 203,537 $ 171,340
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 6.375% 5.75%
Common equity tier 1 capital, For well capitalized purpose, Amount $ 207,528 $ 193,689
Common equity tier 1 capital, For well capitalized purposes, Ratio 6.50% 6.50%
Tier 1 capital (to average assets), Actual, Amount $ 378,899 $ 366,343
Tier 1 capital (to average assets), Actual, Ratio 9.34% 9.89%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 162,327 $ 148,116
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 4.00% 4.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 162,327 $ 148,116
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 4.00% 4.00%
Tier 1 capital (to average assets), For well capitalized purpose, Amount $ 202,908 $ 185,145
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 5.00% 5.00%