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Disclosures about Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Assets: |  |  |
Cash and cash equivalents, carrying value | $ 693,354 | $ 212,505 |
Cash and cash equivalents, fair value | 693,354 | 212,505 |
Debt securities, available for sale | 1,206,431 | 577,198 |
Interest-only GNMA securities |  | 16,272 |
Equity securities | 3,854 | 2,406 |
Loans held for sale | 79,086 | 486,328 |
Total loans and leases receivable, net of allowance for credit losses on loans and leases, carrying value | 15,608,989 | 9,508,367 |
Total loans and leases receivable, net of allowance for credit losses on loans and leases, fair value | 16,222,202 | 9,853,037 |
FHLB, Federal Reserve Bank and other restricted stock, carrying value | 71,368 | 84,214 |
FHLB, Federal Reserve Bank and other restricted stock, fair value | 71,368 | 84,214 |
Derivatives | 54,223 | 23,608 |
Liabilities: |  |  |
Deposits, carrying value | 11,309,929 | 8,648,936 | $ 7,142,236
Deposits, fair value | 11,312,494 | 8,652,340 |
FRB PPP Liquidity facility, carrying value | 4,415,016 | 0 |
FRB PPP Liquidity Facility, fair value | 4,415,016 |  |
Federal funds purchased, carrying value | 250,000 | 538,000 |
Federal funds purchased, fair value | 250,000 | 538,000 |
FHLB advances, carrying value | 850,000 | 850,000 |
FHLB advances, fair value | 852,442 | 852,162 |
Other borrowings, carrying value | 124,037 | 123,630 |
Other borrowings, fair value | 129,120 | 127,603 |
Subordinated debt, carrying value | 181,394 | 181,115 |
Subordinated debt, fair value | 193,119 | 192,217 |
Derivatives | 98,164 | 45,939 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Assets: |  |  |
Cash and cash equivalents, fair value | 693,354 | 212,505 |
Debt securities, available for sale | 0 | 0 |
Interest-only GNMA securities |  | 0 |
Equity securities | 3,854 | 2,406 |
Loans held for sale | 0 | 0 |
Total loans and leases receivable, net of allowance for credit losses on loans and leases, fair value | 0 | 0 |
FHLB, Federal Reserve Bank and other restricted stock, fair value | 0 | 0 |
Derivatives | 0 | 0 |
Liabilities: |  |  |
Deposits, fair value | 10,657,998 | 6,980,402 |
FRB PPP Liquidity Facility, fair value | 0 |  |
Federal funds purchased, fair value | 250,000 | 538,000 |
FHLB advances, fair value | 0 | 0 |
Other borrowings, fair value | 0 | 0 |
Subordinated debt, fair value | 0 | 0 |
Derivatives | 0 | 0 |
Significant Other Observable Inputs (Level 2) |  |  |
Assets: |  |  |
Cash and cash equivalents, fair value | 0 | 0 |
Debt securities, available for sale | 1,206,431 | 577,198 |
Interest-only GNMA securities |  | 0 |
Equity securities | 0 | 0 |
Loans held for sale | 78,443 | 2,130 |
Total loans and leases receivable, net of allowance for credit losses on loans and leases, fair value | 3,616,432 | 2,245,758 |
FHLB, Federal Reserve Bank and other restricted stock, fair value | 71,368 | 84,214 |
Derivatives | 54,023 | 23,529 |
Liabilities: |  |  |
Deposits, fair value | 654,496 | 1,671,938 |
FRB PPP Liquidity Facility, fair value | 4,415,016 |  |
Federal funds purchased, fair value | 0 | 0 |
FHLB advances, fair value | 852,442 | 852,162 |
Other borrowings, fair value | 129,120 | 127,603 |
Subordinated debt, fair value | 193,119 | 192,217 |
Derivatives | 98,164 | 45,939 |
Significant Unobservable Inputs (Level 3) |  |  |
Assets: |  |  |
Cash and cash equivalents, fair value | 0 | 0 |
Debt securities, available for sale | 0 | 0 |
Interest-only GNMA securities |  | 16,272 |
Equity securities | 0 | 0 |
Loans held for sale | 643 | 484,198 |
Total loans and leases receivable, net of allowance for credit losses on loans and leases, fair value | 12,605,770 | 7,607,279 |
FHLB, Federal Reserve Bank and other restricted stock, fair value | 0 | 0 |
Derivatives | 200 | 79 |
Liabilities: |  |  |
Deposits, fair value | 0 | 0 |
FRB PPP Liquidity Facility, fair value | 0 |  |
Federal funds purchased, fair value | 0 | 0 |
FHLB advances, fair value | 0 | 0 |
Other borrowings, fair value | 0 | 0 |
Subordinated debt, fair value | 0 | 0 |
Derivatives | $ 0 | $ 0 |

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- Definition Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + 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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