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Fair Values of Financial Instruments, Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financial assets [Abstract]    
Securities held to maturity $ 525,050 $ 473,140
Financial liabilities [Abstract]    
Time deposits 872,411 908,827
Long-term debt 104,087 130,447
Junior subordinated debt 101,196 101,196
Carrying Amount [Member] | Level 2 [Member]    
Financial assets [Abstract]    
Securities held to maturity 527,948 471,031
Financial liabilities [Abstract]    
Time deposits 872,411 908,827
Long-term debt 104,087 130,447
Junior subordinated debt 101,196 101,196
Carrying Amount [Member] | Level 3 [Member]    
Financial assets [Abstract]    
Net Loans 6,132,857 5,820,115
Estimated Fair Value [Member] | Level 2 [Member]    
Financial assets [Abstract]    
Securities held to maturity 525,050 473,140
Financial liabilities [Abstract]    
Time deposits 868,153 903,501
Long-term debt 104,113 131,268
Junior subordinated debt 102,262 97,346
Estimated Fair Value [Member] | Level 3 [Member]    
Financial assets [Abstract]    
Net Loans $ 6,273,233 $ 5,958,427