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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Securities sold under agreements to repurchase, Underlying Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Assets Sold under Agreements to Repurchase [Line Items] |  |
Amortized Cost of Underlying Securities | $ 354,962 | $ 341,557
Balance of Borrowings | 300,000 | 300,000
Approximate Fair Value of Underlying Securities | $ 350,123 | $ 339,390
Weighted-average interest rates on repurchase agreements | 1.92% | 2.35%
Interest Receivable | $ 57,172 | $ 45,453
Repurchase Agreements [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Interest Receivable | 1,060 | 1,400
US Treasury Securities And Obligations Of Other US Government Sponsored Agencies [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Amortized Cost of Underlying Securities | 132,637 | 126,205
Balance of Borrowings | 127,801 | 123,175
Approximate Fair Value of Underlying Securities | $ 131,271 | $ 125,417
US Treasury Securities And Obligations Of Other US Government Sponsored Agencies [Member] | Repurchase Agreements [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Weighted-average interest rates on repurchase agreements | 1.39% | 1.30%
Mortgage Backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Amortized Cost of Underlying Securities | $ 222,325 | $ 215,352
Balance of Borrowings | 172,199 | 176,825
Approximate Fair Value of Underlying Securities | $ 218,852 | $ 213,973
Mortgage Backed Securities [Member] | Repurchase Agreements [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Weighted-average interest rates on repurchase agreements | 2.29% | 2.20%

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- Definition Amortized cost of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions where counterparty has the right to re-pledge such. + References No definition available. + Details
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- Definition Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions where counterparty has the right to re-pledge such. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying value, as of the balance sheet date, of securities sold under agreements to repurchase where the transferor maintains effective control over the assets, accounting for them as secured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 10 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=77903054&loc=d3e101761-111710 + Details
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