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Regulatory Capital (Details) $ in Thousands | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Regulatory Capital Requirements under Banking Regulations [Abstract] |  |  |  |  |  |  |  |
Capital adequacy, minimum, common equity Tier 1 | 0.0700 |  |  |  |  |  |  |
Capital adequacy, minimum, Tier 1 risk-based capital | 0.0850 |  |  |  |  |  |  |
Capital adequacy, minimum, total risk-based capital | 0.1050 |  |  |  |  |  |  |
Capital adequacy, minimum, leverage ratios | 0.0400 |  |  |  |  |  |  |
Well capitalized, minimum, common equity Tier 1 | 0.0650 |  |  |  |  |  |  |
Well capitalized, minimum, Tier 1 risk-based capital | 0.0800 |  |  |  |  |  |  |
Well capitalized, minimum, total risk-based capital | 0.1000 |  |  |  |  |  |  |
Well capitalized, minimum, leverage ratios | 0.0500 |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Common equity | $ 504,931 | $ 363,140 | $ 361,638 | $ 364,285 | $ 357,221 | $ 352,777 | $ 351,864 | $ 350,693
Goodwill | (63,266) |  |  | (63,266) |  |  |  |
Core deposit intangible (3) | (37,507) |  |  | (5,547) |  |  |  |
DTAs that arise from net operating loss and tax credit carry forwards | (9,158) |  |  | 0 |  |  |  |
AOCI (gains) losses | 10,109 |  |  | 9,021 |  |  |  |
Common Equity Tier 1 Capital | 405,109 |  |  | 304,493 |  |  |  |
TRUPs | 29,079 |  |  | 18,398 |  |  |  |
Tier 1 Capital | 434,188 |  |  | 322,891 |  |  |  |
Allowable reserve for credit losses and other Tier 2 adjustments | 58,190 |  |  | 16,855 |  |  |  |
Subordinated debt | 42,956 |  |  | 24,674 |  |  |  |
Tier 2 Capital | 535,334 |  |  | 364,420 |  |  |  |
Risk-Weighted Assets ("RWA") | 4,707,597 |  |  | 2,619,400 |  |  |  |
Average Assets ("AA") | $ 5,674,370 |  |  | $ 3,390,516 |  |  |  |
Common Tier 1 Capital to RWA | 0.0700 |  |  |  |  |  |  |
Common Tier 1 Capital to RWA | 0.0861 |  |  | 0.1162 |  |  |  |
Tier 1 Capital to RWA | 0.0850 |  |  |  |  |  |  |
Tier 1 Capital to RWA | 0.0922 |  |  | 0.1233 |  |  |  |
Tier 2 Capital to RWA | 0.1050 |  |  |  |  |  |  |
Tier 2 Capital to RWA | 0.1137 |  |  | 0.1391 |  |  |  |
Tier 1 Capital to AA (Leverage) (2) | 0.0765 |  |  | 0.0952 |  |  |  |
The Bank |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |
Common equity | $ 566,129 |  |  | $ 395,594 |  |  |  |
Goodwill | (63,266) |  |  | (63,266) |  |  |  |
Core deposit intangible (3) | (37,507) |  |  | (5,547) |  |  |  |
DTAs that arise from net operating loss and tax credit carry forwards | (6,765) |  |  | 0 |  |  |  |
AOCI (gains) losses | 10,109 |  |  | 9,021 |  |  |  |
Common Equity Tier 1 Capital | 468,700 |  |  | 335,802 |  |  |  |
TRUPs | 0 |  |  | 0 |  |  |  |
Tier 1 Capital | 468,700 |  |  | 335,802 |  |  |  |
Allowable reserve for credit losses and other Tier 2 adjustments | 58,190 |  |  | 16,855 |  |  |  |
Subordinated debt | 0 |  |  | 0 |  |  |  |
Tier 2 Capital | 526,890 |  |  | 352,657 |  |  |  |
Risk-Weighted Assets ("RWA") | 4,703,362 |  |  | 2,618,939 |  |  |  |
Average Assets ("AA") | $ 5,661,864 |  |  | $ 3,386,771 |  |  |  |
Common Tier 1 Capital to RWA | 0.0997 |  |  | 0.1282 |  |  |  |
Tier 1 Capital to RWA | 0.0997 |  |  | 0.1282 |  |  |  |
Tier 2 Capital to RWA | 0.1120 |  |  | 0.1347 |  |  |  |
Tier 1 Capital to AA (Leverage) (2) | 0.0828 |  |  | 0.0992 |  |  |  |

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- Definition Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 + Details
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- Definition Ratio of Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 + Details
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- Definition Amount of Tier 2 risk-based capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 + Details
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