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Disclosures About Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Carrying Amount	$ 182,218	$ 62,135
Cash and cash equivalents, Estimated Fair Value	182,218	62,135
Debt securities, available for sale	589,541	663,294
Debt securities, available for sale, Estimated Fair Value	589,541	663,294
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	17,078
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	17,078
Equity securities, Carrying Amount	2,095	1,718
Equity securities, Estimated Fair Value	2,095	1,718
Loans held for sale, Carrying Amount	502,854	1,507
Loans held for sale, Estimated Fair Value	502,854	1,507
Loans and leases receivable, net of allowance for loan and lease losses, Carrying Amount	9,723,714	8,503,522
Loans and leases receivable, net of allowance for loan losses, Estimated Fair Value	9,991,132	8,481,128
FHLB, Federal Reserve Bank and other restricted stock, Carrying Amount	81,853	89,685
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value	81,853	89,685
Derivative assets	29,174	14,693
Deposits, Carrying Amount	8,925,685	7,142,236
Deposits, Estimated Fair Value	8,929,025	7,136,009
Federal funds purchased, Carrying Amount	373,000	187,000
Federal funds purchased, Estimated Fair Value	373,000	187,000
FHLB advances, Carrying Amount	1,040,800	1,248,070
FHLB advances, Estimated Fair Value	1,042,813	1,248,046
Other borrowings, Carrying Amount	123,528	123,871
Other borrowings, Estimated Fair Value	124,961	121,718
Subordinated debt, Carrying Amount	109,050	108,977
Subordinated debt, Estimated Fair Value	114,686	110,550
Derivative liabilities	58,316	16,286
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	182,218	62,135
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	2,095	1,718
Loans held for sale, Estimated Fair Value	0	0
Loans and leases receivable, net of allowance for loan losses, 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	6,502,812	5,408,055
Federal funds purchased, Estimated Fair Value	373,000	187,000
FHLB advances, Estimated Fair Value	190,800	998,070
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	589,541	663,294
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, Estimated Fair Value	1,755	1,507
Loans and leases receivable, net of allowance for loan losses, Estimated Fair Value	2,438,530	1,405,420
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value	81,853	89,685
Derivative assets	29,024	14,624
Deposits, Estimated Fair Value	2,426,213	1,727,954
Federal funds purchased, Estimated Fair Value	0	0
FHLB advances, Estimated Fair Value	852,013	249,976
Other borrowings, Estimated Fair Value	124,961	121,718
Subordinated debt, Estimated Fair Value	114,686	110,550
Derivative liabilities	58,316	16,286
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	17,078
Equity securities, Estimated Fair Value	0	0
Loans held for sale, Estimated Fair Value	501,099	0
Loans and leases receivable, net of allowance for loan losses, Estimated Fair Value	7,552,602	7,075,708
FHLB, Federal Reserve Bank and other restricted stock, Estimated Fair Value	0	0
Derivative assets	150	69
Deposits, 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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