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Loans and Allowance for Loan Losses - Loans by Portfolio Segment (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Loans and Leases Receivable Disclosure [Abstract] |  |  |  |  |  |
Loans | $ 3,963,041 |  | $ 3,645,162 |  |  |
Less: Allowance for loan losses | 35,449 | $ 35,524 | 35,273 | $ 42,913 | $ 41,454 | $ 49,006
Total loans | 3,927,592 |  | 3,609,889 |  |  |
Construction Real Estate Loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Abstract] |  |  |  |  |  |
Loans | 520,484 |  | 447,860 |  |  |
Less: Allowance for loan losses | 3,399 | 3,604 | 3,787 | 8,018 | 8,201 | 6,490
1-4 Family Residential Real Estate Loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Abstract] |  |  |  |  |  |
Loans | 640,706 |  | 651,140 |  |  |
Less: Allowance for loan losses | 2,024 | 1,982 | 1,866 | 2,520 | 2,508 | 2,270
Commercial Real Estate Loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Abstract] |  |  |  |  |  |
Loans | 1,834,734 |  | 1,598,172 |  |  |
Less: Allowance for loan losses | 27,221 | 27,225 | 26,980 | 28,930 | 27,236 | 35,709
Commercial loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Abstract] |  |  |  |  |  |
Loans | 428,974 |  | 418,998 |  |  |
Less: Allowance for loan losses | 2,558 | 2,454 | 2,397 | 3,097 | 3,108 | 4,107
Municipal loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Abstract] |  |  |  |  |  |
Loans | 457,239 |  | 443,078 |  |  |
Less: Allowance for loan losses | 46 | 48 | 47 | 47 | 46 | 46
Loans to individuals |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Abstract] |  |  |  |  |  |
Loans | 80,904 |  | 85,914 |  |  |
Less: Allowance for loan losses | $ 201 | $ 211 | $ 196 | $ 301 | $ 355 | $ 384

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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