Loans - Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	$ 775,599	$ 771,309
Consumer
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	86,780	86,035
Credit cards
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	7,341	7,623
Performing | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	769,493	764,987
Performing | Consumer
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	86,265	85,308
Performing | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	7,313	7,618
Nonperforming | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	6,106	6,322
Nonperforming | Consumer
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	515	727
Nonperforming | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, net	$ 28	$ 5