Intangible Assets - Changes in Mortgage Servicing Rights (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Changes in mortgage servicing rights
Balance at beginning of period				$ 2,931
Changes in fair value:
Balance at end of period		$ 2,575		2,575
Mortgage servicing rights (MSRs)
Changes in mortgage servicing rights
Balance at beginning of period		2,657	$ 2,813	2,931	$ 2,713
Originated mortgage servicing rights		88	66	187	198
Changes in fair value:
Due to changes in model inputs and assumptions	[1]	(77)	70	(318)	203
Other changes in fair value	[2]	(93)	(78)	(225)	(243)
Total changes in fair value		(170)	(8)	(543)	(40)
Balance at end of period		$ 2,575	$ 2,871	$ 2,575	$ 2,871

[1] The change in fair value resulting from changes in valuation inputs or assumptions, reported in real estate servicing fees, net, used in the valuation model reflects the change in discount rates and prepayment speed assumptions primarily due to changes in interest rates.

[2] Other changes in fair value, reported in real estate servicing fees, net, reflect changes due to customer payments and passage of time.