Commitments - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Commitments [Line Items]
Other Commitments	$ 102,374	$ 88,518
Construction | Commitments to Grant Loans
Other Commitments [Line Items]
Other Commitments	2,000	4,800
Commercial and Industrial | Commitments to Grant Loans
Other Commitments [Line Items]
Other Commitments	2,500	2,200
Commercial and Multi-Family Estate | Commitments to Grant Loans
Other Commitments [Line Items]
Other Commitments	10,900	6,900
Residential Mortgage Home Equity | Unfunded Commitments Under Line of Credit
Other Commitments [Line Items]
Other Commitments	12,900	14,500
Consumer Overdraft Protection | Unfunded Commitments Under Line of Credit
Other Commitments [Line Items]
Other Commitments	374	414
Commercial Loan | Unfunded Commitments Under Line of Credit
Other Commitments [Line Items]
Other Commitments	$ 73,100	59,300
One to Four Family Mortgage Loans | Commitments to Grant Loans
Other Commitments [Line Items]
Other Commitments		$ 281