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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 534,701 $ 427,616
Total capital (to risk-weighted assets), Actual, Ratio 13.53% 13.39%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 316,157 $ 255,419
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 $ 414,956 $ 315,283
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 10.50% 9.875%
Tier 1 capital (to average assets), Actual, Amount $ 516,692 $ 409,760
Tier 1 capital (to average assets), Actual, Ratio 13.07% 12.83%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 237,196 $ 191,565
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 $ 336,028 $ 251,429
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 8.50% 7.875%
Common equity tier 1 capital, Actual Amount $ 459,162 $ 371,297
Common equity tier 1 capital, Actual Ratio 11.61% 11.63%
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 177,970 $ 143,673
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 $ 276,842 $ 203,537
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 7.00% 6.375%
Tier 1 capital (to average assets), Actual, Amount $ 516,692 $ 409,760
Tier 1 capital (to average assets), Actual, Ratio 10.51% 10.12%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 196,648 $ 162,033
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 $ 196,648 $ 162,033
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 $ 477,150 $ 396,755
Total capital (to risk-weighted assets), Actual, Ratio 12.08% 12.43%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 316,012 $ 255,419
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 $ 414,765 $ 315,283
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 10.50% 9.875%
Total capital (to risk-weighted assets), For well capitalized purpose, Amount $ 395,015 $ 319,274
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio 10.00% 10.00%
Tier 1 capital (to average assets), Actual, Amount $ 459,140 $ 378,899
Tier 1 capital (to average assets), Actual, Ratio 11.62% 11.87%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 237,010 $ 191,565
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 $ 335,764 $ 251,429
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 8.50% 7.875%
Tier 1 capital (to average assets), For well capitalized purpose, Amount $ 316,014 $ 255,420
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 8.00% 8.00%
Common equity tier 1 capital, Actual Amount $ 459,140 $ 378,899
Common equity tier 1 capital, Actual Ratio 11.62% 11.87%
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 177,758 $ 143,674
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 $ 276,512 $ 203,537
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 7.00% 6.375%
Common equity tier 1 capital, For well capitalized purpose, Amount $ 256,761 $ 207,528
Common equity tier 1 capital, For well capitalized purposes, Ratio 6.50% 6.50%
Tier 1 capital (to average assets), Actual, Amount $ 459,140 $ 378,899
Tier 1 capital (to average assets), Actual, Ratio 9.35% 9.34%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 196,489 $ 162,327
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 $ 196,489 $ 162,327
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 $ 245,611 $ 202,908
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 5.00% 5.00%