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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 | Mar. 31, 2021 | Dec. 31, 2020
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | $ 2,742,482 | $ 1,916,658
Available-for-sale, Gross Unrealized Gains | 50,154 | 63,237
Available-for-sale, Gross Unrealized Losses | (17,424) | (1,759)
Available-for-sale, Estimated Fair Value | 2,775,212 | 1,978,136
Held-to-maturity, Amortized Cost | 813,740 | 731,212
Held-to-maturity, Gross Unrealized Gains | 29,948 | 37,030
Held-to-maturity, Gross Unrealized Losses | (3,816) | (59)
Held-to-maturity securities, Fair value | 839,872 | 768,183
Total securities, Amortized Cost | 3,556,222 | 2,647,870
Total securities, Gross Unrealized Gains | 80,102 | 100,267
Total securities, Gross Unrealized Losses | (21,240) | (1,818)
Total securities, Estimated Fair Value | 3,615,084 | 2,746,319
US Treasury Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 29,986 | 39,975
Available-for-sale, Gross Unrealized Gains | 11 | 7
Available-for-sale, Estimated Fair Value | 29,997 | 39,982
U.S. Government Sponsored Entities and Agencies [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 174,472 | 204,109
Available-for-sale, Gross Unrealized Gains | 4,564 | 7,715
Available-for-sale, Gross Unrealized Losses | (2,706) | (142)
Available-for-sale, Estimated Fair Value | 176,330 | 211,682
Held-to-maturity, Amortized Cost | 7,611 | 7,779
Held-to-maturity, Gross Unrealized Gains | 106 | 265
Held-to-maturity securities, Fair value | 7,717 | 8,044
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 | 2,123,853 | 1,230,106
Available-for-sale, Gross Unrealized Gains | 30,901 | 35,979
Available-for-sale, Gross Unrealized Losses | (13,961) | (1,348)
Available-for-sale, Estimated Fair Value | 2,140,793 | 1,264,737
Held-to-maturity, Amortized Cost | 80,376 | 89,151
Held-to-maturity, Gross Unrealized Gains | 2,738 | 3,251
Held-to-maturity, Gross Unrealized Losses | (5) |
Held-to-maturity securities, Fair value | 83,109 | 92,402
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 | 284,440 | 308,903
Available-for-sale, Gross Unrealized Gains | 7,962 | 11,464
Available-for-sale, Gross Unrealized Losses | (721) | (269)
Available-for-sale, Estimated Fair Value | 291,681 | 320,098
Obligations of State and Political Subdivisions [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 105,778 | 108,602
Available-for-sale, Gross Unrealized Gains | 6,056 | 7,160
Available-for-sale, Gross Unrealized Losses | (36) |
Available-for-sale, Estimated Fair Value | 111,798 | 115,762
Held-to-maturity, Amortized Cost | 692,616 | 601,128
Held-to-maturity, Gross Unrealized Gains | 24,501 | 30,173
Held-to-maturity, Gross Unrealized Losses | (3,811) | (59)
Held-to-maturity securities, Fair value | 713,306 | 631,242
Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 23,953 | 24,963
Available-for-sale, Gross Unrealized Gains | 660 | 912
Available-for-sale, Estimated Fair Value | 24,613 | 25,875
Held-to-maturity, Amortized Cost | 33,137 | 33,154
Held-to-maturity, Gross Unrealized Gains | 2,603 | 3,341
Held-to-maturity securities, Fair value | $ 35,740 | $ 36,495

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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=121645371&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=121645371&loc=d3e27161-111563 + Details
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