Derivative Financial Instruments (Balance Sheet Category and Fair Values of Derivative Instruments (Not Designated as Hedging Instruments)) (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Cash pledged as collateral	$ 2,200,000	$ 5,300,000
Counterparties
Derivatives, Fair Value [Line Items]
Cash pledged as collateral	0	79,000
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Cash pledged as collateral	768,000	0
Not Designated as Hedging Instrument | Other Assets | Interest rate lock commitments (mortgage)
Assets:
Notional Amount	80,465,000	99,665,000
Fair Value	2,790,000	3,168,000
Not Designated as Hedging Instrument | Other Assets | Forward commitments
Assets:
Notional Amount	142,750,000	118,378,000
Fair Value	2,546,000	523,000
Not Designated as Hedging Instrument | Other Liabilities | Forward commitments
Liabilities:
Notional Amount	59,276,000	136,709,000
Fair Value	(266,000)	(315,000)
Not Designated as Hedging Instrument | Other Liabilities | Undesignated interest rate swaps
Liabilities:
Notional Amount	15,564,000	50,975,000
Fair Value	(1,126,000)	(3,677,000)
Not Designated as Hedging Instrument | Counterparties
Derivatives, Fair Value [Line Items]
Cash pledged as collateral	$ 2,900,000	$ 0