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Regulatory Capital - Summary of Regulatory Capital Requirement (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 687,957 $ 648,804
Total capital (to risk-weighted assets), Actual, Ratio 0.1665 0.1491
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 330,550 $ 348,024
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio 0.0800 0.0800
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 433,847 $ 456,782
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 10.50% 10.50%
Tier 1 capital (to average assets), Actual, Amount $ 634,359 $ 607,340
Tier 1 capital (to average assets), Actual, Ratio 0.1535 0.1396
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 247,958 $ 261,018
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 0.0600 0.0600
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 351,274 $ 369,775
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 8.50% 8.50%
Common equity tier 1 capital, Actual Amount $ 519,058 $ 491,281
Common equity tier 1 capital, Actual Ratio 0.1256 0.1129
Common equity tier 1 capital, For capital adequacy purposes, Amount $ 185,968 $ 195,764
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 capital adequacy purposes with capital buffer, Amount $ 289,284 $ 304,522
Common equity tier 1 capital (to risk-weighted assets), Required for capital adequacy purposes with capital buffer, Ratio 7.00% 7.00%
Tier 1 capital (to average assets), Actual, Amount $ 634,359 $ 607,340
Tier 1 capital (to average assets), Actual, Ratio 0.1076 0.1068
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 235,821 $ 227,507
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 0.0400 0.0400
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 235,821 $ 227,507
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 4.00% 4.00%
Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 573,430 $ 532,315
Total capital (to risk-weighted assets), Actual, Ratio 0.1409 0.1221
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 325,581 $ 348,810
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio 0.0800 0.0800
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 427,325 $ 457,813
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 10.50% 10.50%
Total capital (to risk-weighted assets), For well capitalized purpose, Amount $ 406,977 $ 436,013
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio 0.1000 0.1000
Tier 1 capital (to average assets), Actual, Amount $ 520,873 $ 492,221
Tier 1 capital (to average assets), Actual, Ratio 0.1280 0.1129
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 244,159 $ 261,606
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 0.0600 0.0600
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 345,892 $ 370,609
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 8.50% 8.50%
Tier 1 capital (to average assets), For well capitalized purpose, Amount $ 325,546 $ 348,808
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 0.0800 0.0800
Common equity tier 1 capital, Actual Amount $ 520,873 $ 492,221
Common equity tier 1 capital, Actual Ratio 0.1280 0.1129
Common equity tier 1 capital, For capital adequacy purposes, Amount $ 183,119 $ 196,205
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 capital adequacy purposes with capital buffer, Amount $ 284,852 $ 305,207
Common equity tier 1 capital (to risk-weighted assets), Required for capital adequacy purposes with capital buffer, Ratio 7.00% 7.00%
Common equity tier 1 capital, For well capitalized purpose, Amount $ 264,506 $ 283,407
Common equity tier 1 capital, For well capitalized purposes, Ratio 6.50% 6.50%
Tier 1 capital (to average assets), Actual, Amount $ 520,873 $ 492,221
Tier 1 capital (to average assets), Actual, Ratio 0.0879 0.0871
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 237,030 $ 226,158
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 0.0400 0.0400
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 237,030 $ 226,158
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 $ 296,287 $ 282,697
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 0.0500 0.0500