Fair Value Measurements (Financial Instruments) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Financial assets:
Cash and cash equivalents	$ 687,570	$ 532,353
Available for sale debt securities, at fair value	1,216,936	1,105,489
Investment securities held to maturity, fair value	463,993	472,529
Federal Home Loan Bank stock	48,998	59,489
Equity securities	1,026	971
Total loans	9,717,945	9,721,424
Financial liabilities:
Certificates of deposit	963,004	1,094,174
Total deposits	10,297,513	9,837,829
Borrowed funds	940,611	1,175,972
Subordinated debentures	25,173	25,135
Derivative liabilities	38,500
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	687,570	532,353
Available for sale debt securities, at fair value	0	1,009
Investment securities held to maturity, fair value	8,904	7,601
Federal Home Loan Bank stock	48,998	59,489
Equity securities	1,026	971
Total loans	0	0
Derivative assets	0	0
Financial liabilities:
Deposits other than certificates of deposits	9,334,509	8,743,655
Certificates of deposit	0	0
Total deposits	9,334,509	8,743,655
Borrowed funds	0	0
Subordinated debentures	0	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	1,216,936	1,104,480
Investment securities held to maturity, fair value	455,089	464,850
Federal Home Loan Bank stock	0	0
Equity securities	0	0
Total loans	0	0
Derivative assets	76,542	101,079
Financial liabilities:
Deposits other than certificates of deposits	0	0
Certificates of deposit	967,088	1,097,993
Total deposits	967,088	1,097,993
Borrowed funds	945,538	1,193,024
Subordinated debentures	30,325	24,375
Derivative liabilities	78,228	109,148
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
Total loans	9,857,891	9,969,330
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	0
Derivative liabilities	0	0
US Treasury Obligations \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Available for sale debt securities, at fair value		0
US Treasury Obligations \| Significant Other Observable Inputs (Level 2)
Financial assets:
Available for sale debt securities, at fair value		0
US Treasury Obligations \| Significant Unobservable Inputs (Level 3)
Financial assets:
Available for sale debt securities, at fair value		0
Agency Obligations \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Available for sale debt securities, at fair value		1,009
Investment securities held to maturity, fair value	8,904	7,601
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	1,060,152	938,413
Investment securities held to maturity, fair value	51	64
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	1,060,152	938,413
Investment securities held to maturity, fair value	51	64
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	49,205	53,830
Asset-backed securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Available for sale debt securities, at fair value
Asset-backed securities \| Significant Other Observable Inputs (Level 2)
Financial assets:
Available for sale debt securities, at fair value	49,205	53,830
Asset-backed securities \| Significant Unobservable Inputs (Level 3)
Financial assets:
Available for sale debt securities, at fair value
State And Municipal Obligations
Financial assets:
Available for sale debt securities, at fair value	68,934	71,258
Investment securities held to maturity, fair value	444,776	455,039
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	68,934	71,258
Investment securities held to maturity, fair value	444,776	454,973
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	38,645	40,979
Investment securities held to maturity, fair value	10,262	9,825
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	38,645	40,979
Investment securities held to maturity, fair value	10,262	9,813
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		532,353	$ 687,570
Available for sale debt securities, at fair value	1,216,936	1,105,489
Investment securities held to maturity, fair value	447,902	450,965
Federal Home Loan Bank stock	48,998	59,489
Equity securities	1,026	971
Total loans	9,717,945	9,721,424
Derivative assets	76,542	101,079
Financial liabilities:
Deposits other than certificates of deposits	9,334,509	8,743,655
Certificates of deposit	963,004	1,094,174
Total deposits	10,297,513	9,837,829
Borrowed funds	940,611	1,175,972
Subordinated debentures	25,173	25,135
Derivative liabilities	78,228	109,148
Carrying Value \| US Treasury Obligations
Financial assets:
Available for sale debt securities, at fair value
Carrying Value \| Agency Obligations
Financial assets:
Available for sale debt securities, at fair value		1,009
Investment securities held to maturity, fair value	8,998	7,600
Carrying Value \| Mortgage-backed securities
Financial assets:
Available for sale debt securities, at fair value	1,060,152	938,413
Investment securities held to maturity, fair value	50	62
Carrying Value \| Asset-backed securities
Financial assets:
Available for sale debt securities, at fair value	49,205	53,830
Carrying Value \| State And Municipal Obligations
Financial assets:
Available for sale debt securities, at fair value	68,934	71,258
Investment securities held to maturity, fair value	428,571	433,589
Carrying Value \| Corporate Obligations
Financial assets:
Available for sale debt securities, at fair value	38,645	40,979
Investment securities held to maturity, fair value	10,283	9,714
Fair Value
Financial assets:
Cash and cash equivalents	687,570	532,353
Available for sale debt securities, at fair value	1,216,936	1,105,489
Investment securities held to maturity, fair value	463,993	472,451
Federal Home Loan Bank stock	48,998	59,489
Equity securities	1,026	971
Total loans	9,857,891	9,969,330
Derivative assets	76,542	101,079
Financial liabilities:
Deposits other than certificates of deposits	9,334,509	8,743,655
Certificates of deposit	967,088	1,097,993
Total deposits	10,301,597	9,841,648
Borrowed funds	945,538	1,193,024
Subordinated debentures	30,325	24,375
Derivative liabilities	78,228	109,148
Fair Value \| US Treasury Obligations
Financial assets:
Available for sale debt securities, at fair value		0
Fair Value \| Agency Obligations
Financial assets:
Available for sale debt securities, at fair value		1,009
Investment securities held to maturity, fair value	8,904	7,601
Fair Value \| Mortgage-backed securities
Financial assets:
Available for sale debt securities, at fair value	1,060,152	938,413
Investment securities held to maturity, fair value	51	64
Fair Value \| Asset-backed securities
Financial assets:
Available for sale debt securities, at fair value	49,205	53,830
Fair Value \| State And Municipal Obligations
Financial assets:
Available for sale debt securities, at fair value	68,934	71,258
Investment securities held to maturity, fair value	444,776	454,973
Fair Value \| Corporate Obligations
Financial assets:
Available for sale debt securities, at fair value	38,645	40,979
Investment securities held to maturity, fair value	$ 10,262	$ 9,813

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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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