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Loans and Allowance for Loan Losses - Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Loans Receivable |  |
Loan Portfolio Internal Grading System Classification | $ 5,225,529 | $ 5,052,046
Commercial construction |  |
Loan Portfolio Internal Grading System Classification | 1,212,837 | 1,322,861
Commercial Real Estate |  |
Loan Portfolio Internal Grading System Classification | 1,553,677 | 1,494,172
Industrial revenue bonds |  |
Loan Portfolio Internal Grading System Classification | 14,003 | 13,189
Consumer auto |  |
Loan Portfolio Internal Grading System Classification | 86,173 | 151,854
Home Equity Line of Credit |  |
Loan Portfolio Internal Grading System Classification | 114,689 | 118,988
Land development |  |
Loan Portfolio Internal Grading System Classification | 54,010 | 40,431
One- to four-family residential construction |  |
Loan Portfolio Internal Grading System Classification | 42,793 | 33,963
Subdivision construction |  |
Loan Portfolio Internal Grading System Classification | 30,894 | 16,088
Owner occupied one- to four-family residential |  |
Loan Portfolio Internal Grading System Classification | 470,436 | 387,016
Non-owner occupied one- to four-family residential |  |
Loan Portfolio Internal Grading System Classification | 114,569 | 120,343
Other residential |  |
Loan Portfolio Internal Grading System Classification | 1,021,145 | 866,006
Commercial business |  |
Loan Portfolio Internal Grading System Classification | 370,898 | 313,209
Consumer other |  |
Loan Portfolio Internal Grading System Classification | 40,762 | 46,720
Acquired Loans Net of Discount |  |
Loan Portfolio Internal Grading System Classification | 98,643 | 127,206
Satisfactory | Loans Receivable |  |
Loan Portfolio Internal Grading System Classification | 5,153,396 | 5,005,765
Satisfactory | Commercial construction |  |
Loan Portfolio Internal Grading System Classification | 1,212,837 | 1,322,861
Satisfactory | Commercial Real Estate |  |
Loan Portfolio Internal Grading System Classification | 1,498,031 | 1,458,400
Satisfactory | Industrial revenue bonds |  |
Loan Portfolio Internal Grading System Classification | 14,003 | 13,189
Satisfactory | Consumer auto |  |
Loan Portfolio Internal Grading System Classification | 85,657 | 150,874
Satisfactory | Home Equity Line of Credit |  |
Loan Portfolio Internal Grading System Classification | 114,049 | 118,428
Satisfactory | Land development |  |
Loan Portfolio Internal Grading System Classification | 54,010 | 40,431
Satisfactory | One- to four-family residential construction |  |
Loan Portfolio Internal Grading System Classification | 41,428 | 33,963
Satisfactory | Subdivision construction |  |
Loan Portfolio Internal Grading System Classification | 30,874 | 16,061
Satisfactory | Owner occupied one- to four-family residential |  |
Loan Portfolio Internal Grading System Classification | 467,855 | 385,001
Satisfactory | Non-owner occupied one- to four-family residential |  |
Loan Portfolio Internal Grading System Classification | 114,176 | 119,743
Satisfactory | Other residential |  |
Loan Portfolio Internal Grading System Classification | 1,017,648 | 866,006
Satisfactory | Commercial business |  |
Loan Portfolio Internal Grading System Classification | 363,681 | 307,322
Satisfactory | Consumer other |  |
Loan Portfolio Internal Grading System Classification | 40,514 | 46,294
Satisfactory | Acquired Loans Net of Discount |  |
Loan Portfolio Internal Grading System Classification | 98,633 | 127,192
Watch | Loans Receivable |  |
Loan Portfolio Internal Grading System Classification | 64,758 | 37,368
Watch | Commercial Real Estate |  |
Loan Portfolio Internal Grading System Classification | 52,208 | 32,063
Watch | Consumer auto |  |
Loan Portfolio Internal Grading System Classification | 5 | 47
Watch | Home Equity Line of Credit |  |
Loan Portfolio Internal Grading System Classification | 39 | 43
Watch | One- to four-family residential construction |  |
Loan Portfolio Internal Grading System Classification | 1,365 |
Watch | Subdivision construction |  |
Loan Portfolio Internal Grading System Classification |  | 27
Watch | Owner occupied one- to four-family residential |  |
Loan Portfolio Internal Grading System Classification | 216 | 26
Watch | Non-owner occupied one- to four-family residential |  |
Loan Portfolio Internal Grading System Classification | 324 | 419
Watch | Other residential |  |
Loan Portfolio Internal Grading System Classification | 3,497 |
Watch | Commercial business |  |
Loan Portfolio Internal Grading System Classification | 7,102 | 4,651
Watch | Consumer other |  |
Loan Portfolio Internal Grading System Classification | 2 | 92
Substandard | Loans Receivable |  |
Loan Portfolio Internal Grading System Classification | 7,375 | 8,913
Substandard | Commercial Real Estate |  |
Loan Portfolio Internal Grading System Classification | 3,438 | 3,709
Substandard | Consumer auto |  |
Loan Portfolio Internal Grading System Classification | 511 | 933
Substandard | Home Equity Line of Credit |  |
Loan Portfolio Internal Grading System Classification | 601 | 517
Substandard | Subdivision construction |  |
Loan Portfolio Internal Grading System Classification | 20 |
Substandard | Owner occupied one- to four-family residential |  |
Loan Portfolio Internal Grading System Classification | 2,365 | 1,989
Substandard | Non-owner occupied one- to four-family residential |  |
Loan Portfolio Internal Grading System Classification | 69 | 181
Substandard | Commercial business |  |
Loan Portfolio Internal Grading System Classification | 115 | 1,236
Substandard | Consumer other |  |
Loan Portfolio Internal Grading System Classification | 246 | 334
Substandard | Acquired Loans Net of Discount |  |
Loan Portfolio Internal Grading System Classification | $ 10 | $ 14

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