Loans - Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, net	$ 786,354	$ 771,309
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, net	89,331	86,035
Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, net	7,284	7,623
Performing | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, net	781,335	765,823
Performing | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, net	88,777	85,322
Performing | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, net	7,263	7,618
Nonperforming | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, net	5,019	5,486
Nonperforming | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, net	554	713
Nonperforming | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, net	$ 21	$ 5