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Securities - Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Total, Face Amount |  | $ 522,391
Total, Amortized Cost |  | 514,599
Total, Gross Unrealized Gain |  | 292
Total, Gross Unrealized Loss |  | (37,463)
Total, Carrying Value/Estimated Fair Value |  | 477,428
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Held to Maturity, Face Amount |  | 146,530
Held to Maturity, Amortized Cost |  | 146,352
Held to Maturity, Gross Unrealized Gain |  | 0
Held to Maturity, Gross Unrealized Loss |  | 0
Held to Maturity, Carrying Value/Estimated Fair Value |  | 146,352
Commercial Mortgage Backed Securities [Member] | Estimated Fair Value [Member] | Available-for-sale Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value Option, Face Amount | $ 300,064 | 375,861
Fair Value Option, Amortized Cost | 293,312 | 368,247
Fair Value Option, Gross Unrealized Gain | 147 | 292
Fair Value Option, Gross Unrealized Loss | (38,975) | (37,463)
Fair Value Option, Carrying Value/Estimated Fair Value | $ 254,484 | $ 331,076

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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