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Borrowed Funds - Debt Disclosure by Year (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Debt Disclosure [Abstract] |  |
Securities sold under repurchase agreements, maximum balance | $ 210,702,000 | $ 283,233,000
FHLB line of credit, maximum balance | 472,000,000 | 173,000,000
FHLB advances, maximum balance | 1,288,448,000 | 1,343,095,000
Securities sold under repurchase agreements, average balance | 164,982,000 | 224,421,000
FHLB line of credit, average balance | 179,003,000 | 37,608,000
FHLB advances, average balance | $ 1,237,979,000 | $ 1,315,278,000
Securities sold under repurchase agreements, weighted average interest rate | 1.26% | 1.42%
FHLB line of credit, weighted average interest rate | 1.17% | 0.61%
FHLB advances, weighted average interest rate | 1.78% | 1.76%

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- Definition The calculated average balance outstanding for the year for all Federal Home Loan Bank advances as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The calculated weighted average interest rate for Federal Home Loan Bank advances for the period ended as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The maximum balance outstanding at any month end during the period as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Maximum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
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