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Repurchase Agreements (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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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 | $ 297,800 | $ 302,300
Remaining contractual maturity of securities sold under agreements to repurchase by class of collateral pledged [Abstract] |  |
Repurchase agreements and repurchase-to-maturity transactions | 257,208 | 251,065
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 | 112,120 | 95,989
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 | 11,000 | 0
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 | 37,000 | 24,350
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 | 97,088 | 130,726
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 | 114,437 | 104,674
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 | 29,137 | 17,249
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 | 4,871 | 0
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 | 21,050 | 14,349
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 | 59,379 | 73,076
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 | 71,768 | 67,624
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 | 58,845 | 55,354
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 | 2,261 | 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 | 3,297 | 1,998
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 | 7,365 | 10,272
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 | 71,003 | 78,767
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 | 24,138 | 23,386
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 | 3,868 | 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 | 12,653 | 8,003
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 | $ 30,344 | $ 47,378

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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=66008989&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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