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Borrowings (Collateral Pledged for Repurchase Agreements) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Available-for-sale Securities Pledged as Collateral | $ 230,263 | $ 97,671
Short-term Borrowings | 32,811 | 53,235
US Treasury Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Available-for-sale Securities Pledged as Collateral | 35,147 | 36,316
Maturity Overnight [Member] | US Treasury Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Available-for-sale Securities Pledged as Collateral | 34,917 | 35,515
Maturity Less than 30 Days [Member] | US Treasury Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Available-for-sale Securities Pledged as Collateral | 0 | 139
Maturity 30 to 90 Days [Member] | US Treasury Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Available-for-sale Securities Pledged as Collateral | 0 | 277
Maturity Greater than 90 Days [Member] | US Treasury Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Available-for-sale Securities Pledged as Collateral | 230 | 385
Securities Sold under Agreements to Repurchase [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Available-for-sale Securities Pledged as Collateral | 35,147 | 36,316
Short-term Borrowings | $ 32,811 | $ 33,563

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