Loans - Loans Sales (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total net gains on loan sales		$ 5,562	$ 7,078	$ 8,931
Corporate loan sales
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales		17,900	52,974	54,681
Less book value of loans sold		17,498	51,781	52,821
Total net gains on loan sales	[1]	402	1,193	1,860
1-4 family mortgage loan sales
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales		245,967	258,626	290,383
Less book value of loans sold		240,807	252,741	283,312
Total net gains on loan sales	[2]	$ 5,160	$ 5,885	$ 7,071

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

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