Loans, Allowance for Loan Losses and Allowance for Unfunded Credit Commitments Recorded Investment in Loans Modified in TDRs within Previous 12 months Subsequently Defaulted (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment subsequently defaulted	$ 3,641,000	$ 0
Commercial loans
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment subsequently defaulted	3,105,000
Consumer loans
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment subsequently defaulted	536,000
Commercial Portfolio Segment | Hardware
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment subsequently defaulted	3,105,000
Consumer Portfolio Segment [Member] | Other
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investment subsequently defaulted	$ 536,000