Fair Value Measurements and Fair Value of Financial Instruments, Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financial assets [Abstract]
HTM securities	$ 864,234	$ 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	936,512	733,210
Financial liabilities [Abstract]
Time deposits	465,764	501,472
Long-term debt	3,347	13,995
Junior subordinated debt	101,196	101,196
Carrying Amount [Member] | Level 3 [Member]
Financial assets [Abstract]
Net loans	7,684,209	7,407,289
Estimated Fair Value [Member] | Level 1 [Member]
Financial liabilities [Abstract]
Subordinated debt	98,793	107,402
Estimated Fair Value [Member] | Level 2 [Member]
Financial assets [Abstract]
HTM securities	864,234	735,260
Financial liabilities [Abstract]
Time deposits	453,540	500,717
Long-term debt	3,264	14,260
Junior subordinated debt	96,175	107,569
Estimated Fair Value [Member] | Level 3 [Member]
Financial assets [Abstract]
Net loans	$ 7,580,692	$ 7,530,768