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Repurchase Agreements (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Carrying value of investment securities available for sale pledged as collateral under repurchase agreements | $ 290,700 | $ 283,300
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 256,153 | 235,186
Overnight and Continuous [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 109,581 | 105,556
Up to 30 Days [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 49,000 | 1,000
30-90 Days [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 717 | 24,544
Greater Than 90 Days [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 96,855 | 104,086
U.S. Treasury and Government Agencies [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 74,644 | 28,700
U.S. Treasury and Government Agencies [Member] | Overnight and Continuous [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 19,986 | 6,790
U.S. Treasury and Government Agencies [Member] | Up to 30 Days [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 22,400 | 1,000
U.S. Treasury and Government Agencies [Member] | 30-90 Days [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 0 | 6,834
U.S. Treasury and Government Agencies [Member] | Greater Than 90 Days [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 32,258 | 14,076
State and Political Subdivisions [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 71,532 | 73,764
State and Political Subdivisions [Member] | Overnight and Continuous [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 59,293 | 59,451
State and Political Subdivisions [Member] | Up to 30 Days [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 2,330 | 0
State and Political Subdivisions [Member] | 30-90 Days [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 508 | 1,839
State and Political Subdivisions [Member] | Greater Than 90 Days [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 9,401 | 12,474
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 109,977 | 132,722
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] | Overnight and Continuous [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 30,302 | 39,315
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] | Up to 30 Days [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 24,270 | 0
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] | 30-90 Days [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 209 | 15,871
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] | Greater Than 90 Days [Member] |  |
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | $ 55,196 | $ 77,536

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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5086-111524 + Details
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- Definition Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Repurchase Agreement Accounted for as a Collateralized Borrowing -URI http://asc.fasb.org/extlink&oid=49203159 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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