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Fair Values of Financial Instruments, Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financial assets [Abstract]    
HTM securities $ 778,675 $ 481,871
Financial liabilities: [Abstract]    
Time deposits 930,678 806,766
Long-term debt 73,724 88,869
Junior subordinated debt 101,196 101,196
Carrying Amount [Member] | Level 2 [Member]    
Financial assets [Abstract]    
HTM securities 783,599 484,073
Financial liabilities: [Abstract]    
Time deposits 930,678 806,766
Long-term debt 73,724 88,869
Junior subordinated debt 101,196 101,196
Carrying Amount [Member] | Level 3 [Member]    
Financial assets [Abstract]    
Net Loans 6,822,147 6,515,273
Estimated Fair Value [Member] | Level 2 [Member]    
Financial assets [Abstract]    
HTM securities 778,675 481,871
Financial liabilities: [Abstract]    
Time deposits 920,534 801,294
Long-term debt 73,927 88,346
Junior subordinated debt 100,114 104,593
Estimated Fair Value [Member] | Level 3 [Member]    
Financial assets [Abstract]    
Net Loans $ 6,754,460 $ 6,651,931