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Disclosures About Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents, Carrying Amount $ 331,416 $ 212,505
Cash and cash equivalents, Estimated Fair Value 331,416 212,505
Debt securities, available for sale 1,131,365 577,198
Debt securities, available for sale, Estimated Fair Value 1,131,365 577,198
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election, Carrying Amount   16,272
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election, Estimated Fair Value   16,272
Equity securities, Carrying Amount 2,466 2,406
Equity securities, Estimated Fair Value 2,466 2,406
Loans held for sale 26,689 486,328
Total loans and leases receivable, net of allowance for credit losses 16,423,029 9,508,367
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 17,070,867 9,853,037
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount 70,387 84,214
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 70,387 84,214
Derivative assets 60,810 23,608
Deposits, Carrying Amount 10,839,077 8,648,936
Deposits, Estimated Fair Value 10,843,133 8,652,340
FRB advances, Carrying Amount 4,811,009  
FRB advances, Estimated Fair Value 4,811,009  
Federal funds purchased, Carrying Amount 680,000 538,000
Federal funds purchased, Estimated Fair Value 680,000 538,000
FHLB advances, Carrying Amount 850,000 850,000
FHLB advances, Estimated Fair Value 854,104 852,162
Other borrowings, Carrying Amount 123,935 123,630
Other borrowings, Estimated Fair Value 102,594 127,603
Subordinated debt, Carrying Amount 181,324 181,115
Subordinated debt, Estimated Fair Value 178,958 192,217
Derivative liabilities 110,649 45,939
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 331,416 212,505
Debt securities, available for sale, Estimated Fair Value 0 0
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election, Estimated Fair Value   0
Equity securities, Estimated Fair Value 2,466 2,406
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 9,866,651 6,980,402
FRB advances, Estimated Fair Value 0  
Federal funds purchased, Estimated Fair Value 680,000 538,000
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, Estimated Fair Value 1,131,365 577,198
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election, Estimated Fair Value   0
Equity securities, Estimated Fair Value 0 0
Loans held for sale 6,998 2,130
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 3,913,593 2,245,758
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 70,387 84,214
Derivative assets 60,355 23,529
Deposits, Estimated Fair Value 976,482 1,671,938
FRB advances, Estimated Fair Value 4,811,009  
Federal funds purchased, Estimated Fair Value 0 0
FHLB advances, Estimated Fair Value 854,104 852,162
Other borrowings, Estimated Fair Value 102,594 127,603
Subordinated debt, Estimated Fair Value 178,958 192,217
Derivative liabilities 110,649 45,939
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, Estimated Fair Value 0 0
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election, Estimated Fair Value   16,272
Equity securities, Estimated Fair Value 0 0
Loans held for sale 19,691 484,198
Total loans and leases receivable, net of allowance for credit losses on loans and leases, Estimated Fair Value 13,157,274 7,607,279
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value 0 0
Derivative assets 455 79
Deposits, Estimated Fair Value 0 0
FRB advances, Estimated Fair Value 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