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Fair Values of Financial Instruments, Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financial assets [Abstract]    
HTM securities $ 735,260 $ 636,827
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 733,210 616,560
Financial liabilities [Abstract]    
Time deposits 501,472 633,479
Long-term debt 13,995 39,097
Junior subordinated debt 101,196 101,196
Carrying Amount [Member] | Level 3 [Member]    
Financial assets [Abstract]    
Net loans 7,407,289 7,390,004
Estimated Fair Value [Member] | Level 1 [Member]    
Financial liabilities [Abstract]    
Subordinated debt 107,402 103,277
Estimated Fair Value [Member] | Level 2 [Member]    
Financial assets [Abstract]    
HTM securities 735,260 636,827
Financial liabilities [Abstract]    
Time deposits 500,717 638,721
Long-term debt 14,260 39,820
Junior subordinated debt 107,569 108,926
Estimated Fair Value [Member] | Level 3 [Member]    
Financial assets [Abstract]    
Net loans $ 7,530,768 $ 7,530,033