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Accumulated Other Comprehensive Loss ("AOCL") (Components of Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax $ (1,194) $ 531
Cash flow hedges: Unrealized holding gains, Before Tax 766 133
Cash flow hedges: Unrealized holding gains, Tax Effect (305) (53)
Cash flow hedges: Unrealized holding gains, Net of Tax 461 80
Unrealized net actuarial gain (loss), Net of Tax (1,569) (1,271)
Other Comprehensive Income, Before Tax Amount (4,192) 2,148
Other Comprehensive Income, Tax (Expense) Benefit 1,671 (859)
Other Comprehensive Income, Net (2,521) 1,289
Investment securities- with OTTI [Member]    
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Before Tax Amount (700) 2,985
Available for sale (AFS) securities with OTTI: Unrealized holding gains, tax effect 279 (1,192)
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Net of Tax (421) 1,793
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Before Tax Amount 9 (580)
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax Effect (4) 232
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Net of Tax 5 (348)
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI: Net unrealized gains on investments with OTTI, Tax Effect 283 (1,156)
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Before Tax Amount (709) 2,893
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Net of Tax (426) 1,737
Securities: Less: gains (losses) recognized in income, Before Tax   672
Securities: Less: gains (losses) recognized in income, Tax Effect   (268)
Securities: Less: gains (losses) recognized in income, Net of Tax   404
Investment Securities -All Other AFS [Member]    
Securities: Unrealized holding gains (losses), Before Tax (1,545) 1,174
Securities: Unrealized holding gains (losses), Tax Effect 616 (469)
Securities: Unrealized holding gains (losses), Net of Tax (929) 705
Securities: Less: gains (losses) recognized in income, Before Tax 440 290
Securities: Less: gains (losses) recognized in income, Tax Effect (175) (116)
Securities: Less: gains (losses) recognized in income, Net of Tax 265 174
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Before Tax (1,985) 884
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Tax Effect 791 (353)
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax (1,194) 531
Investment Securities HTM [Member]    
Securities: Unrealized holding gains (losses), Before Tax 0 0
Securities: Unrealized holding gains (losses), Tax Effect 0 0
Securities: Unrealized holding gains (losses), Net of Tax 0 0
Securities: Less: gains (losses) recognized in income, Before Tax (1,026) (473)
Securities: Less: gains (losses) recognized in income, Tax Effect 409 189
Securities: Less: gains (losses) recognized in income, Net of Tax (617) (284)
Held to maturity securities: Net unrealized gains (losses) on all HTM securities, Before tax 1,026 473
Held to maturity securities: Net unrealized gains (losses) on all HTM securities, Tax (409) (189)
Held to maturity securities: Net unrealized gains (losses) on all HTM securities, After tax 617 284
Pension Plan [Member]    
Unrealized net actuarial gain (loss), Before Tax (3,468) (2,890)
Unrealized net actuarial gain (loss), Tax Effect 1,382 1,154
Unrealized net actuarial gain (loss), Net of Tax (2,086) (1,736)
Less: amortization of unrecognized net gain (loss), Before Tax (848) (781)
Less: amortization of unrecognized net gain (loss), Tax Effect 338 312
Less: amortization of unrecognized net gain (loss), Net of Tax (510) (469)
Less: amortization of transition asset, Before Tax 0 19
Less: amortization of transition asset, Tax Effect 0 (8)
Less: amortization of transition asset, Net of Tax 0 11
Less: amortization of prior service costs, Before Tax (12) (12)
Less: amortization of prior service costs, Tax Effect 5 5
Less: amortization of prior service costs, Net of Tax (7) (7)
Net plan liability adjustment, Before Tax (2,608) (2,116)
Net plan liability adjustment, Tax Effect 1,039 845
Net plan liability adjustment, Net of Tax (1,569) (1,271)
SERP [Member]    
Unrealized net actuarial gain (loss), Before Tax (775) (188)
Unrealized net actuarial gain (loss), Tax Effect 309 75
Unrealized net actuarial gain (loss), Net of Tax (466) (113)
Less: amortization of unrecognized net gain (loss), Before Tax (73) (49)
Less: amortization of unrecognized net gain (loss), Tax Effect 29 20
Less: amortization of unrecognized net gain (loss), Net of Tax (44) (29)
Less: amortization of prior service costs, Before Tax (20) (20)
Less: amortization of prior service costs, Tax Effect 8 8
Less: amortization of prior service costs, Net of Tax (12) (12)
Net plan liability adjustment, Before Tax (682) (119)
Net plan liability adjustment, Tax Effect 272 47
Net plan liability adjustment, Net of Tax (410) (72)
Parent Company [Member]    
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Before Tax (795) (3,521)
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Tax Effect 317 1,406
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax $ (478) $ (2,115)