Derivative Instruments (Derivative Assets Offset in The Consolidated Balance Sheets) (Details) - Non-hedging interest rate derivatives: - Interest Rate Swap $ in Thousands	Sep. 30, 2017 USD ($)
Customer Counterparties Loan Interest Rate Swap Assets
Offsetting Assets [Line Items]
Gross amounts of recognized assets	$ 7,570
Net Amounts of Assets presented in the Statement of Financial Position	7,570
Fair Value of collateral	7,570
Total Gross amounts not offset in the statement of financial position including applicable netting agreement and fair value of collateral	7,570
Net Amount	0
Financial Institution Counterparties Loan Interest Rate Swap Asset
Offsetting Assets [Line Items]
Gross amounts of recognized assets	6,903
Net Amounts of Assets presented in the Statement of Financial Position	6,903
Fair Value of collateral	0
Total Gross amounts not offset in the statement of financial position including applicable netting agreement and fair value of collateral	0
Net Amount	$ 6,903