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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 624,112 | $ 583,444
Gross Unrealized Gain | 1,925 | 401
Gross Unrealized Loss | 4,567 | 8,937
Estimated Fair Value | 621,470 | 574,908
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 54,584 | 39,768
Gross Unrealized Gain | 148 | 69
Gross Unrealized Loss | 4 | 7
Estimated Fair Value | 54,728 | 39,830
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 356,973 | 300,957
Gross Unrealized Gain | 566 | 61
Gross Unrealized Loss | 2,938 | 5,984
Estimated Fair Value | 354,601 | 295,034
Collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 153,286 | 124,550
Gross Unrealized Gain | 298 | 74
Gross Unrealized Loss | 1,557 | 2,332
Estimated Fair Value | 152,027 | 122,292
Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 17,472 | 7,499
Gross Unrealized Gain | 74 | 0
Gross Unrealized Loss | 53 | 97
Estimated Fair Value | 17,493 | 7,402
Total U.S. government agency and sponsored agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 527,731 | 433,006
Gross Unrealized Gain | 938 | 135
Gross Unrealized Loss | 4,548 | 8,413
Estimated Fair Value | 524,121 | 424,728
Municipal bonds-tax exempt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 41,797 | 110,670
Gross Unrealized Gain | 839 | 197
Gross Unrealized Loss | 15 | 517
Estimated Fair Value | $ 42,621 | $ 110,350

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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