Fair Value (Details) - Carrying Value of Mortgage Servicing Rights - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance		$ 1,853	$ 1,728	$ 1,893
Additions from acquisition		3,092	0	0
New MSRs		1,263	342	315
Total (losses) gains included in earnings:
Changes in valuation inputs and assumptions	[1]	610	(11)	(480)
Other changes in fair value	[1],[2]	(698)	(206)	0
Ending balance		6,120	1,853	1,728
Contractual servicing fees earned during the year	[1]	1,312	546	520
Total amount of loans being serviced for the benefit of others at the end of the year		$ 640,530	$ 242,915	$ 220,372

[1] Included in mortgage banking income in the Consolidated Statements of Income and relate to assets still held at the end of the year.

[2] Primarily represents changes in expected future cash flows over time due to payoffs and paydowns.