Loans - Schedule of Loans Renegotiated in Troubled Debt Restructurings (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) note	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) note	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans renegotiated in troubled debt restructurings	$ 45,859,000		$ 45,859,000		$ 49,652,000
Loans renegotiated in troubled debt restructurings, non-accrual loans	34,997,000		34,997,000		27,309,000
Loans renegotiated in troubled debt restructurings, accrual loans	$ 10,862,000		$ 10,862,000		$ 22,343,000
Number of Notes | note	1		21
Loans restructured during period	$ 611,000		$ 11,308,000
Charge-offs directly related to modifying troubled debt restructurings	$ 0	$ 0	$ 0	$ 0
Number of notes under default | note	2		4
Balance of defaulted loans under trouble debt restructurings	$ 1,477,000		$ 7,235,000
Commitments to lend additional funds	0		0
Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans restructured during period	0		1,986,000
Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans restructured during period	0		2,356,000
Interest Rate Adjustment Concession
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans restructured during period	0		0
Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans restructured during period	$ 611,000		$ 6,966,000
Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | note			5
Loans restructured during period			$ 2,772,000
Number of notes under default | note	1		2
Balance of defaulted loans under trouble debt restructurings	$ 177,000		$ 2,407,000
Commercial | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans restructured during period			1,475,000
Commercial | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans restructured during period			388,000
Commercial | Interest Rate Adjustment Concession
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans restructured during period			0
Commercial | Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans restructured during period			$ 909,000
Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | note	1		16
Loans restructured during period	$ 611,000		$ 8,536,000
Number of notes under default | note	1		1
Balance of defaulted loans under trouble debt restructurings	$ 1,300,000		$ 1,300,000
Commercial | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans restructured during period	0		511,000
Commercial | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans restructured during period	0		1,968,000
Commercial | Interest Rate Adjustment Concession
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans restructured during period	0		0
Commercial | Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans restructured during period	$ 611,000		$ 6,057,000
Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of notes under default | note	0		1
Balance of defaulted loans under trouble debt restructurings	$ 0		$ 3,528,000