Fair Value Measurements and Fair Value of Financial Instruments, Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financial assets [Abstract]
HTM securities	$ 812,664	$ 812,647
Carrying Amount [Member] | Level 1 [Member]
Financial liabilities [Abstract]
Subordinated debt	98,000	98,000
Carrying Amount [Member] | Level 2 [Member]
Financial assets [Abstract]
HTM securities	906,824	919,517
Financial liabilities [Abstract]
Time deposits	784,467	433,772
Long-term debt	29,790	4,815
Junior subordinated debt	101,196	101,196
Carrying Amount [Member] | Level 3 [Member]
Financial assets [Abstract]
Net loans	8,164,753	8,049,909
Estimated Fair Value [Member] | Level 1 [Member]
Financial liabilities [Abstract]
Subordinated debt	91,506	92,883
Estimated Fair Value [Member] | Level 2 [Member]
Financial assets [Abstract]
HTM securities	812,664	812,647
Financial liabilities [Abstract]
Time deposits	743,678	413,868
Long-term debt	29,469	4,539
Junior subordinated debt	98,443	98,372
Estimated Fair Value [Member] | Level 3 [Member]
Financial assets [Abstract]
Net loans	$ 7,785,338	$ 7,840,350