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Disclosures About Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents, Carrying Amount | $ 515,364 | $ 693,354
Cash and cash equivalents, Estimated Fair Value | 515,364 | 693,354
Debt securities, available for sale | 1,437,077 | 1,206,431
Equity securities | 4,827 | 3,854
Loans held for sale | 46,106 | 79,086
Total loans and leases receivable, net of allowance for credit losses on loans and leases | 15,993,464 | 15,608,989
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value | 16,487,438 | 16,222,202
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount | 69,420 | 71,368
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 69,420 | 71,368
Derivative assets | 36,502 | 54,223
Deposits, Carrying Amount | 12,472,440 | 11,309,929
Deposits, Estimated Fair Value | 12,473,798 | 11,312,494
FRB PPP Liquidity Facility, Carrying Amount | 3,284,156 | 4,415,016
FRB PPP Liquidity Facility, Estimated Fair Value | 3,284,156 | 4,415,016
Federal funds purchased, Carrying Amount | 365,000 | 250,000
Federal funds purchased, Estimated Fair Value | 365,000 | 250,000
FHLB advances, Carrying Amount | 850,000 | 850,000
FHLB advances, Estimated Fair Value | 850,787 | 852,442
Other borrowings, Carrying Amount | 124,138 | 124,037
Other borrowings, Estimated Fair Value | 135,571 | 129,120
Subordinated debt, Carrying Amount | 181,464 | 181,394
Subordinated debt, Estimated Fair Value | 197,080 | 193,119
Derivative liabilities | 37,536 | 98,164
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents, Estimated Fair Value | 515,364 | 693,354
Debt securities, available for sale | 0 | 0
Equity securities | 4,827 | 3,854
Loans held for sale | 0 | 0
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value | 0 | 0
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 0 | 0
Derivative assets | 0 | 0
Deposits, Estimated Fair Value | 11,806,559 | 10,657,998
FRB PPP Liquidity Facility, Estimated Fair Value | 0 | 0
Federal funds purchased, Estimated Fair Value | 365,000 | 250,000
FHLB advances, Estimated Fair Value | 0 | 0
Other borrowings, Estimated Fair Value | 0 | 0
Subordinated debt, Estimated Fair Value | 0 | 0
Derivative liabilities | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents, Estimated Fair Value | 0 | 0
Debt securities, available for sale | 1,437,077 | 1,206,431
Equity securities | 0 | 0
Loans held for sale | 45,463 | 78,443
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value | 3,407,622 | 3,616,432
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 69,420 | 71,368
Derivative assets | 36,306 | 54,023
Deposits, Estimated Fair Value | 667,239 | 654,496
FRB PPP Liquidity Facility, Estimated Fair Value | 3,284,156 | 4,415,016
Federal funds purchased, Estimated Fair Value | 0 | 0
FHLB advances, Estimated Fair Value | 850,787 | 852,442
Other borrowings, Estimated Fair Value | 135,571 | 129,120
Subordinated debt, Estimated Fair Value | 197,080 | 193,119
Derivative liabilities | 37,536 | 98,164
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents, Estimated Fair Value | 0 | 0
Debt securities, available for sale | 0 | 0
Equity securities | 0 | 0
Loans held for sale | 643 | 643
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value | 13,079,816 | 12,605,770
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value | 0 | 0
Derivative assets | 196 | 200
Deposits, Estimated Fair Value | 0 | 0
FRB PPP Liquidity Facility, Estimated Fair Value | 0 | 0
Federal funds purchased, Estimated Fair Value | 0 | 0
FHLB advances, Estimated Fair Value | 0 | 0
Other borrowings, Estimated Fair Value | 0 | 0
Subordinated debt, Estimated Fair Value | 0 | 0
Derivative liabilities | $ 0 | $ 0

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- Definition Federal Home Loan Bank Stock And Federal Reserve Bank Stock Fair Value + References No definition available. + Details
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- Definition Amount 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 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=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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