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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 384,800 $ 316,576
Total capital (to risk-weighted assets), Actual, Ratio 12.91% 13.87%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 238,543 $ 182,596
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 $ 275,816 $ 196,976
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 9.25% 8.63%
Tier 1 capital (to average assets), Actual, Amount $ 368,355 $ 301,739
Tier 1 capital (to average assets), Actual, Ratio 12.35% 13.22%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 178,907 $ 136,947
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 $ 216,180 $ 151,326
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 7.25% 6.63%
Common equity tier 1 capital, Actual Amount $ 329,892 $ 263,313
Common equity tier 1 capital, Actual Ratio 11.06% 11.50%
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 134,181 $ 103,036
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 $ 171,454 $ 117,460
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 5.75% 5.13%
Tier 1 capital (to average assets), Actual, Amount $ 368,355 $ 301,739
Tier 1 capital (to average assets), Actual, Ratio 9.92% 10.44%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 148,503 $ 115,609
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 $ 148,503 $ 115,609
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 $ 382,788 $ 319,013
Total capital (to risk-weighted assets), Actual, Ratio 12.85% 13.98%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 238,386 $ 182,541
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 $ 275,634 $ 196,916
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 9.25% 8.63%
Total capital (to risk-weighted assets), For well capitalized purpose, Amount $ 297,982 $ 228,176
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio 10.00% 10.00%
Tier 1 capital (to average assets), Actual, Amount $ 366,343 $ 304,176
Tier 1 capital (to average assets), Actual, Ratio 12.29% 13.33%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 178,790 $ 136,905
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 $ 216,038 $ 151,280
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 7.25% 6.63%
Tier 1 capital (to average assets), For well capitalized purpose, Amount $ 238,386 $ 182,540
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 8.00% 8.00%
Common equity tier 1 capital, Actual Amount $ 366,343 $ 304,176
Common equity tier 1 capital, Actual Ratio 12.29% 13.33%
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 134,092 $ 102,679
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 $ 171,340 $ 117,054
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 5.75% 5.13%
Common equity tier 1 capital, For well capitalized purpose, Amount $ 193,689 $ 148,314
Common equity tier 1 capital, For well capitalized purposes, Ratio 6.50% 6.50%
Tier 1 capital (to average assets), Actual, Amount $ 366,343 $ 304,176
Tier 1 capital (to average assets), Actual, Ratio 9.89% 9.93%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 148,116 $ 122,521
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 $ 148,116 $ 122,521
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 $ 185,145 $ 153,151
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 5.00% 5.00%