Goodwill and Other Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 35,813	$ 34,767
Accumulated amortization	26,798	24,483
Net carrying amount	9,015	10,284
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	6,788	6,788
Accumulated amortization	4,610	4,026
Net carrying amount	2,178	2,762
Customer Related Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	7,604	8,819
Accumulated amortization	7,046	7,923
Net carrying amount	558	896
Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	21,421	19,160
Accumulated amortization	15,142	12,534
Net carrying amount	$ 6,279	$ 6,626