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Regulatory Capital - Summary of Regulatory Capital Requirement (Details) $ in Thousands | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital (to risk-weighted assets), Actual, Amount | $ 678,665 | $ 648,804
Total capital (to risk-weighted assets), Actual, Ratio | 0.1527 | 0.1491
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 355,555 | $ 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 | $ 466,666 | $ 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 | $ 634,105 | $ 607,340
Tier 1 capital (to average assets), Actual, Ratio | 0.1427 | 0.1396
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 266,617 | $ 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 | $ 377,708 | $ 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 | $ 518,670 | $ 491,281
Common equity tier 1 capital, Actual Ratio | 0.1167 | 0.1129
Common equity tier 1 capital, For capital adequacy purposes, Amount | $ 200,001 | $ 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 | $ 311,113 | $ 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 | $ 634,105 | $ 607,340
Tier 1 capital (to average assets), Actual, Ratio | 0.1003 | 0.1068
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 252,883 | $ 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 | $ 252,883 | $ 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 | $ 575,693 | $ 532,315
Total capital (to risk-weighted assets), Actual, Ratio | 0.1297 | 0.1221
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 355,092 | $ 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 | $ 466,058 | $ 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 | $ 443,865 | $ 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 | $ 526,731 | $ 492,221
Tier 1 capital (to average assets), Actual, Ratio | 0.1186 | 0.1129
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 266,474 | $ 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 | $ 377,505 | $ 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 | $ 355,299 | $ 348,808
Tier 1 capital (to average assets), For well capitalized purposes, Ratio | 0.0800 | 0.0800
Common equity tier 1 capital, Actual Amount | $ 526,731 | $ 492,221
Common equity tier 1 capital, Actual Ratio | 0.1186 | 0.1129
Common equity tier 1 capital, For capital adequacy purposes, Amount | $ 199,856 | $ 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 | $ 310,887 | $ 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 | $ 288,681 | $ 283,407
Common equity tier 1 capital, For well capitalized purposes, Ratio | 6.50% | 6.50%
Tier 1 capital (to average assets), Actual, Amount | $ 526,731 | $ 492,221
Tier 1 capital (to average assets), Actual, Ratio | 0.0838 | 0.0871
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 251,423 | $ 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 | $ 251,423 | $ 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 | $ 314,279 | $ 282,697
Tier 1 capital (to average assets), For well capitalized purposes, Ratio | 0.0500 | 0.0500

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