Loans Loans - Internal Credit Assessment (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	$ 2,835,883	$ 2,698,844
Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	5,782	792
Consumer Portfolio
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	642,066	708,404
Consumer Portfolio | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	642,025	708,132
Consumer Portfolio | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	41	272
Consumer Portfolio | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	320,451	399,898
Consumer Portfolio | Residential mortgage | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	320,451	399,723
Consumer Portfolio | Residential mortgage | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	0	175
Consumer Portfolio | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	25,042	28,735
Consumer Portfolio | Home equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	25,042	28,680
Consumer Portfolio | Home equity | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	0	55
Consumer Portfolio | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	296,573	279,771
Consumer Portfolio | Other consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	296,532	279,729
Consumer Portfolio | Other consumer | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	$ 41	$ 42