Loans, Loan Ratings by Loan Class, Commercial (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	$ 2,730,882	$ 2,591,058
Accrued interest included in total	8,436	8,538
Commercial [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	1,192,022	1,147,892
Accrued interest included in total	3,005	3,411
Commercial [Member] | Non-Watch 1-6 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	1,106,006	1,082,607
Accrued interest included in total	2,713	3,107
Commercial [Member] | Watch 7-8 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	83,054	57,184
Accrued interest included in total	284	174
Commercial [Member] | Substandard Accrual 9 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	2,221	5,777
Accrued interest included in total	8	130
Commercial [Member] | Non-Accrual 10-11 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	741	2,324
Accrued interest included in total	0	0
Commercial [Member] | Income Producing - Real Estate [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	424,516	388,773
Commercial [Member] | Income Producing - Real Estate [Member] | Non-Watch 1-6 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	408,132	375,142
Commercial [Member] | Income Producing - Real Estate [Member] | Watch 7-8 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	15,619	13,387
Commercial [Member] | Income Producing - Real Estate [Member] | Substandard Accrual 9 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	765	200
Commercial [Member] | Income Producing - Real Estate [Member] | Non-Accrual 10-11 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	0	44
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	102,227	84,458
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Non-Watch 1-6 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	93,563	76,120
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Watch 7-8 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	8,010	8,328
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Substandard Accrual 9 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	0	0
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Non-Accrual 10-11 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	654	10
Commercial [Member] | Commercial and Industrial [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	665,279	674,661
Commercial [Member] | Commercial and Industrial [Member] | Non-Watch 1-6 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	604,311	631,345
Commercial [Member] | Commercial and Industrial [Member] | Watch 7-8 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	59,425	35,469
Commercial [Member] | Commercial and Industrial [Member] | Substandard Accrual 9 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	1,456	5,577
Commercial [Member] | Commercial and Industrial [Member] | Non-Accrual 10-11 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	$ 87	$ 2,270