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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,970,076 | $ 2,078,131
Gross Unrealized Holding Gain, Available-for-sale | 3,247 | 13,282
Gross Unrealized Holding Loss, Available-for-sale | (31,731) | (10,428)
Fair Value, Available-for-sale | $ 1,941,592 | $ 2,080,985
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 798,284 | $ 829,890
Gross Unrealized Holding Gain, Held-to-maturity | 1,233 | 4,272
Gross Unrealized Holding Loss, Held-to-maturity | (23,387) | (14,947)
Fair Value, Held-to-maturity | $ 776,130 | $ 819,215
Total Percent, Held-to-maturity | 100.00% | 100.00%
CMO/REMIC - Residential [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 259,180 | $ 274,634
Gross Unrealized Holding Gain, Available-for-sale | 644 | 1,277
Gross Unrealized Holding Loss, Available-for-sale | (4,178) | (2,082)
Fair Value, Available-for-sale | $ 255,646 | $ 273,829
Total Percent, Available-for-sale | 13.17% | 13.16%
Amortized Cost, Held-to-maturity | $ 221,051 | $ 225,072
Gross Unrealized Holding Gain, Held-to-maturity | 0 | 0
Gross Unrealized Holding Loss, Held-to-maturity | (11,522) | (8,641)
Fair Value, Held-to-maturity | $ 209,529 | $ 216,431
Total Percent, Held-to-maturity | 27.69% | 27.12%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Held-to-maturity | $ 154,194 | $ 159,716
Gross Unrealized Holding Gain, Held-to-maturity | 473 | 854
Gross Unrealized Holding Loss, Held-to-maturity | (2,453) | (2,134)
Fair Value, Held-to-maturity | $ 152,214 | $ 158,436
Total Percent, Held-to-maturity | 19.32% | 19.25%
Residential Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,655,742 | $ 1,747,780
Gross Unrealized Holding Gain, Available-for-sale | 2,158 | 11,231
Gross Unrealized Holding Loss, Available-for-sale | (26,560) | (8,102)
Fair Value, Available-for-sale | $ 1,631,340 | $ 1,750,909
Total Percent, Available-for-sale | 84.02% | 84.14%
Amortized Cost, Held-to-maturity | $ 170,573 | $ 176,427
Gross Unrealized Holding Gain, Held-to-maturity | 0 | 667
Gross Unrealized Holding Loss, Held-to-maturity | (3,191) | (382)
Fair Value, Held-to-maturity | $ 167,382 | $ 176,712
Total Percent, Held-to-maturity | 21.36% | 21.26%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 54,416 | $ 54,966
Gross Unrealized Holding Gain, Available-for-sale | 445 | 774
Gross Unrealized Holding Loss, Available-for-sale | (993) | (244)
Fair Value, Available-for-sale | $ 53,868 | $ 55,496
Total Percent, Available-for-sale | 2.77% | 2.66%
Amortized Cost, Held-to-maturity | $ 252,466 | $ 268,675
Gross Unrealized Holding Gain, Held-to-maturity | 760 | 2,751
Gross Unrealized Holding Loss, Held-to-maturity | (6,221) | (3,790)
Fair Value, Held-to-maturity | $ 247,005 | $ 267,636
Total Percent, Held-to-maturity | 31.63% | 32.37%
Other Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 738 | $ 751
Gross Unrealized Holding Gain, Available-for-sale | 0 | 0
Gross Unrealized Holding Loss, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | $ 738 | $ 751
Total Percent, Available-for-sale | 0.04% | 0.04%

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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