Loans, Loan Ratings by Loan Class, Commercial (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	$ 2,715,664	$ 2,591,058
Accrued interest included in total	9,138	8,538
Commercial [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	1,179,364	1,147,892
Accrued interest included in total	3,394	3,411
Commercial [Member] | Non-Watch 1-6 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	1,100,267	1,082,510
Accrued interest included in total	3,158	3,107
Commercial [Member] | Watch 7-8 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	72,842	57,184
Accrued interest included in total	219	174
Commercial [Member] | Substandard Accrual 9 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	5,452	5,777
Accrued interest included in total	17	130
Commercial [Member] | Non-Accrual 10-11 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	803	2,421
Accrued interest included in total	0	0
Commercial [Member] | Income Producing - Real Estate [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	398,747	388,773
Commercial [Member] | Income Producing - Real Estate [Member] | Non-Watch 1-6 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	382,198	375,142
Commercial [Member] | Income Producing - Real Estate [Member] | Watch 7-8 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	15,777	13,387
Commercial [Member] | Income Producing - Real Estate [Member] | Substandard Accrual 9 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	772	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	93,213	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	83,971	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	8,467	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	775	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	0	10
Commercial [Member] | Commercial and Industrial [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	687,404	674,661
Commercial [Member] | Commercial and Industrial [Member] | Non-Watch 1-6 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	634,098	631,248
Commercial [Member] | Commercial and Industrial [Member] | Watch 7-8 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	48,598	35,469
Commercial [Member] | Commercial and Industrial [Member] | Substandard Accrual 9 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	3,905	5,577
Commercial [Member] | Commercial and Industrial [Member] | Non-Accrual 10-11 [Member]
Summary of Loan Ratings by Loan Class [Abstract]
Commercial	$ 803	$ 2,367