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Securities - Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | $ 2,177,178 | $ 2,142,056
Available-for-sale, Gross Unrealized Gains | 36,621 | 5,861
Available-for-sale, Gross Unrealized Losses | (4,600) | (33,788)
Available-for-sale, Estimated Fair Value | 2,209,199 | 2,114,129
Held-to-maturity, Amortized Cost | 852,824 | 1,020,934
Held-to-maturity, Gross Unrealized Gains | 25,356 | 8,993
Held-to-maturity, Gross Unrealized Losses | (371) | (9,184)
Held-to-maturity securities, Fair value | 877,809 | 1,020,743
Total securities, Amortized Cost | 3,030,002 | 3,162,990
Total securities, Gross Unrealized Gains | 61,977 | 14,854
Total securities, Gross Unrealized Losses | (4,971) | (42,972)
Total securities, Estimated Fair Value | 3,087,008 | 3,134,872
US Treasury Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 29,817 | 19,882
Available-for-sale, Gross Unrealized Gains | 61 | 3
Available-for-sale, Gross Unrealized Losses |  | (7)
Available-for-sale, Estimated Fair Value | 29,878 | 19,878
U.S. Government Sponsored Entities and Agencies [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 116,508 | 142,852
Available-for-sale, Gross Unrealized Gains | 4,012 | 556
Available-for-sale, Gross Unrealized Losses | (79) | (1,756)
Available-for-sale, Estimated Fair Value | 120,441 | 141,652
Held-to-maturity, Amortized Cost | 9,854 | 10,823
Held-to-maturity, Gross Unrealized Gains | 53 | 6
Held-to-maturity, Gross Unrealized Losses | (46) | (329)
Held-to-maturity securities, Fair value | 9,861 | 10,500
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 1,663,942 | 1,585,864
Available-for-sale, Gross Unrealized Gains | 21,469 | 2,912
Available-for-sale, Gross Unrealized Losses | (4,346) | (27,521)
Available-for-sale, Estimated Fair Value | 1,681,065 | 1,561,255
Held-to-maturity, Amortized Cost | 129,797 | 148,300
Held-to-maturity, Gross Unrealized Gains | 1,273 | 204
Held-to-maturity, Gross Unrealized Losses | (155) | (4,170)
Held-to-maturity securities, Fair value | 130,915 | 144,334
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 183,634 | 171,671
Available-for-sale, Gross Unrealized Gains | 4,716 | 264
Available-for-sale, Gross Unrealized Losses | (45) | (2,963)
Available-for-sale, Estimated Fair Value | 188,305 | 168,972
Obligations of State and Political Subdivisions [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 145,593 | 184,057
Available-for-sale, Gross Unrealized Gains | 5,771 | 2,039
Available-for-sale, Gross Unrealized Losses | (1) | (982)
Available-for-sale, Estimated Fair Value | 151,363 | 185,114
Held-to-maturity, Amortized Cost | 679,932 | 828,520
Held-to-maturity, Gross Unrealized Gains | 22,244 | 8,771
Held-to-maturity, Gross Unrealized Losses | (170) | (4,012)
Held-to-maturity securities, Fair value | 702,006 | 833,279
Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 37,684 | 37,730
Available-for-sale, Gross Unrealized Gains | 592 | 87
Available-for-sale, Gross Unrealized Losses | (129) | (559)
Available-for-sale, Estimated Fair Value | 38,147 | 37,258
Held-to-maturity, Amortized Cost | 33,241 | 33,291
Held-to-maturity, Gross Unrealized Gains | 1,786 | 12
Held-to-maturity, Gross Unrealized Losses |  | (673)
Held-to-maturity securities, Fair value | $ 35,027 | $ 32,630

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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=118939692&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=118939692&loc=d3e27161-111563 + Details
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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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