Fair Value Measurements (Financial Instruments) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2018
Financial assets:
Cash and cash equivalents	$ 510,138	$ 186,748
Available for sale debt securities, at fair value	1,100,391	976,919
Investment securities held to maturity, fair value	467,693	467,966
Federal Home Loan Bank stock	69,975	57,298
Equity securities	869	825
Loans, net of allowance for credit losses	9,650,495	7,277,360
Financial liabilities:
Certificates of deposit	1,144,688	734,027
Total deposits	9,559,241	7,102,609
Borrowed funds	1,413,029	1,125,146
Derivative liabilities	135,500
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	510,138	186,748
Available for sale debt securities, at fair value	1,084	0
Investment securities held to maturity, fair value	9,088	6,601
Federal Home Loan Bank stock	69,975	57,298
Equity securities	869	825
Loans, net of allowance for credit losses	0	0
Derivative assets	0	0
Financial liabilities:
Deposits other than certificates of deposits	8,414,553	6,368,582
Certificates of deposit	0	0
Total deposits	8,414,553	6,368,582
Borrowed funds	0	0
Subordinated debentures	0
Derivative liabilities	0	0
Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and cash equivalents	0	0
Available for sale debt securities, at fair value	1,099,307	976,919
Investment securities held to maturity, fair value	458,605	461,365
Federal Home Loan Bank stock	0	0
Equity securities	0	0
Loans, net of allowance for credit losses	0	0
Derivative assets	117,722	39,305
Financial liabilities:
Deposits other than certificates of deposits	0	0
Certificates of deposit	1,148,156	734,047
Total deposits	1,148,156	734,047
Borrowed funds	1,424,689	1,127,569
Subordinated debentures	24,050
Derivative liabilities	126,577	39,356
Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	0	0
Available for sale debt securities, at fair value	0	0
Investment securities held to maturity, fair value	0	0
Federal Home Loan Bank stock	0	0
Equity securities	0	0
Loans, net of allowance for credit losses	9,917,269	7,296,744
Derivative assets	0	0
Financial liabilities:
Deposits other than certificates of deposits	0	0
Certificates of deposit	0	0
Total deposits	0	0
Borrowed funds	0	0
Subordinated debentures	0
Derivative liabilities	0	0
Agency Obligations \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Available for sale debt securities, at fair value			$ 1,084
Investment securities held to maturity, fair value	9,088	6,601
Agency Obligations \| Significant Other Observable Inputs (Level 2)
Financial assets:
Available for sale debt securities, at fair value			0
Investment securities held to maturity, fair value	0	0
Agency Obligations \| Significant Unobservable Inputs (Level 3)
Financial assets:
Available for sale debt securities, at fair value			0
Investment securities held to maturity, fair value	0	0
Mortgage-Backed Securities
Financial assets:
Available for sale debt securities, at fair value	934,171	947,430
Investment securities held to maturity, fair value	77	122
Mortgage-Backed Securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Available for sale debt securities, at fair value	0	0
Investment securities held to maturity, fair value	0	0
Mortgage-Backed Securities \| Significant Other Observable Inputs (Level 2)
Financial assets:
Available for sale debt securities, at fair value	934,171	947,430
Investment securities held to maturity, fair value	77	122
Mortgage-Backed Securities \| Significant Unobservable Inputs (Level 3)
Financial assets:
Available for sale debt securities, at fair value	0	0
Investment securities held to maturity, fair value	0	0
Asset-backed securities
Financial assets:
Available for sale debt securities, at fair value	53,868
Asset-backed securities \| Significant Other Observable Inputs (Level 2)
Financial assets:
Available for sale debt securities, at fair value	53,868
State And Municipal Obligations
Financial assets:
Available for sale debt securities, at fair value	70,518	4,079
Investment securities held to maturity, fair value	449,448	451,353
State And Municipal Obligations \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Available for sale debt securities, at fair value	0	0
Investment securities held to maturity, fair value	0	0
State And Municipal Obligations \| Significant Other Observable Inputs (Level 2)
Financial assets:
Available for sale debt securities, at fair value	70,518	4,079
Investment securities held to maturity, fair value	449,448	451,353
State And Municipal Obligations \| Significant Unobservable Inputs (Level 3)
Financial assets:
Available for sale debt securities, at fair value	0	0
Investment securities held to maturity, fair value	0	0
Corporate Obligations
Financial assets:
Available for sale debt securities, at fair value	40,750	25,410
Investment securities held to maturity, fair value	9,080	9,890
Corporate Obligations \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Available for sale debt securities, at fair value	0	0
Investment securities held to maturity, fair value	0	0
Corporate Obligations \| Significant Other Observable Inputs (Level 2)
Financial assets:
Available for sale debt securities, at fair value	40,750	25,410
Investment securities held to maturity, fair value	9,080	9,890
Corporate Obligations \| Significant Unobservable Inputs (Level 3)
Financial assets:
Available for sale debt securities, at fair value	0	0
Investment securities held to maturity, fair value	0	0
Carrying Value
Financial assets:
Cash and cash equivalents		186,748
Available for sale debt securities, at fair value	1,100,391	976,919
Investment securities held to maturity, fair value	446,591	453,629
Federal Home Loan Bank stock	69,975	57,298
Equity securities	869	825
Loans, net of allowance for credit losses	9,650,495	7,277,360
Derivative assets	117,722	39,305
Financial liabilities:
Deposits other than certificates of deposits	8,414,553	6,368,582
Certificates of deposit	1,144,688	734,027
Total deposits	9,559,241	7,102,609
Borrowed funds	1,413,029	1,125,146
Subordinated debentures	25,099
Derivative liabilities	126,577	39,356
Carrying Value \| Agency Obligations
Financial assets:
Available for sale debt securities, at fair value			1,084
Investment securities held to maturity, fair value	9,100	6,599
Carrying Value \| Mortgage-Backed Securities
Financial assets:
Available for sale debt securities, at fair value	934,171	947,430
Investment securities held to maturity, fair value	75	118
Carrying Value \| Asset-backed securities
Financial assets:
Available for sale debt securities, at fair value	53,868
Carrying Value \| State And Municipal Obligations
Financial assets:
Available for sale debt securities, at fair value	70,518	4,079
Investment securities held to maturity, fair value	428,465	437,074
Carrying Value \| Corporate Obligations
Financial assets:
Available for sale debt securities, at fair value	40,750	25,410
Investment securities held to maturity, fair value	8,951	9,838
Fair Value
Financial assets:
Cash and cash equivalents	510,138	186,748
Available for sale debt securities, at fair value	1,100,391	976,919
Investment securities held to maturity, fair value	467,693	467,966
Federal Home Loan Bank stock	69,975	57,298
Equity securities	869	825
Loans, net of allowance for credit losses	9,917,269	7,296,744
Derivative assets	117,722	39,305
Financial liabilities:
Deposits other than certificates of deposits	8,414,553	6,368,582
Certificates of deposit	1,148,156	734,047
Total deposits	9,562,709	7,102,629
Borrowed funds	1,424,689	1,127,569
Subordinated debentures	24,050
Derivative liabilities	126,577	39,356
Fair Value \| Agency Obligations
Financial assets:
Available for sale debt securities, at fair value			$ 1,084
Investment securities held to maturity, fair value	9,088	6,601
Fair Value \| Mortgage-Backed Securities
Financial assets:
Available for sale debt securities, at fair value	934,171	947,430
Investment securities held to maturity, fair value	77	122
Fair Value \| Asset-backed securities
Financial assets:
Available for sale debt securities, at fair value	53,868
Fair Value \| State And Municipal Obligations
Financial assets:
Available for sale debt securities, at fair value	70,518	4,079
Investment securities held to maturity, fair value	449,448	451,353
Fair Value \| Corporate Obligations
Financial assets:
Available for sale debt securities, at fair value	40,750	25,410
Investment securities held to maturity, fair value	$ 9,080	$ 9,890

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Financial Liabilities [Abstract]

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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