Loans (Details) - Loans Sales - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total net gains on loan sales		$ 8,931	$ 6,847	$ 4,069
Corporate loan sales
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales		54,681	31,091	23,222
Less book value of loans sold		52,821	29,535	22,924
Total net gains on loan sales	[1]	1,860	1,556	298
1-4 family mortgage loan sales
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales		290,383	185,308	148,680
Less book value of loans sold		283,312	180,017	144,909
Total net gains on loan sales	[2]	$ 7,071	$ 5,291	$ 3,771

[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 mortgage loan sales are included in mortgage banking income in the Consolidated Statements of Income.