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