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Regulatory Capital - Summary of Regulatory Capital Requirement (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 669,098 $ 648,804
Total capital (to risk-weighted assets), Actual, Ratio 0.1694 0.1491
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 315,985 $ 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 $ 414,730 $ 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 $ 622,085 $ 607,340
Tier 1 capital (to average assets), Actual, Ratio 0.1575 0.1396
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 236,985 $ 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 $ 335,728 $ 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 $ 506,877 $ 491,281
Common equity tier 1 capital, Actual Ratio 0.1284 0.1129
Common equity tier 1 capital, For capital adequacy purposes, Amount $ 177,644 $ 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 $ 276,335 $ 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 $ 622,085 $ 607,340
Tier 1 capital (to average assets), Actual, Ratio 0.1082 0.1068
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 229,976 $ 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 $ 229,976 $ 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 $ 548,682 $ 532,315
Total capital (to risk-weighted assets), Actual, Ratio 0.1386 0.1221
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 316,700 $ 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 $ 415,668 $ 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 $ 395,874 $ 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 $ 503,222 $ 492,221
Tier 1 capital (to average assets), Actual, Ratio 0.1271 0.1129
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 237,556 $ 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 $ 336,537 $ 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 $ 316,741 $ 348,808
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 0.0800 0.0800
Common equity tier 1 capital, Actual Amount $ 503,222 $ 492,221
Common equity tier 1 capital, Actual Ratio 0.1271 0.1129
Common equity tier 1 capital, For capital adequacy purposes, Amount $ 178,167 $ 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 $ 277,148 $ 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 $ 257,352 $ 283,407
Common equity tier 1 capital, For well capitalized purposes, Ratio 6.50% 6.50%
Tier 1 capital (to average assets), Actual, Amount $ 503,222 $ 492,221
Tier 1 capital (to average assets), Actual, Ratio 0.0881 0.0871
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 228,478 $ 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 $ 228,478 $ 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 $ 285,597 $ 282,697
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 0.0500 0.0500