Loans - Loans Sales (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total net gains on loan sales		$ 1,410	$ 1,625
Corporate loan sales
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales		3,198	8,321
Less book value of loans sold		3,116	8,123
Total net gains on loan sales	[1]	82	198
1-4 family mortgage loan sales
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales		58,783	65,185
Less book value of loans sold		57,455	63,758
Total net gains on loan sales	[2]	$ 1,328	$ 1,427

[1] Net gains on corporate loan sales are included in other service charges, commissions, and fees in the Condensed Consolidated Statements of Income.

[2] Net gains on 1-4 family mortgage loan sales are included in mortgage banking income in the Condensed Consolidated Statements of Income.