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Fair Value Measurements and Fair Value of Financial Instruments, Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial assets [Abstract] |  |
HTM securities | $ 851,635 | $ 735,260
Carrying Amount [Member] | Level 1 [Member] |  |
Financial liabilities [Abstract] |  |
Subordinated debt | 100,000 | 100,000
Carrying Amount [Member] | Level 2 [Member] |  |
Financial assets [Abstract] |  |
HTM securities | 895,005 | 733,210
Financial liabilities [Abstract] |  |
Time deposits | 487,977 | 501,472
Long-term debt | 13,971 | 13,995
Junior subordinated debt | 101,196 | 101,196
Carrying Amount [Member] | Level 3 [Member] |  |
Financial assets [Abstract] |  |
Net loans | 7,560,089 | 7,407,289
Estimated Fair Value [Member] | Level 1 [Member] |  |
Financial liabilities [Abstract] |  |
Subordinated debt | 102,218 | 107,402
Estimated Fair Value [Member] | Level 2 [Member] |  |
Financial assets [Abstract] |  |
HTM securities | 851,635 | 735,260
Financial liabilities [Abstract] |  |
Time deposits | 480,294 | 500,717
Long-term debt | 13,983 | 14,260
Junior subordinated debt | 102,624 | 107,569
Estimated Fair Value [Member] | Level 3 [Member] |  |
Financial assets [Abstract] |  |
Net loans | $ 7,611,744 | $ 7,530,768

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