Fair Value Measurements (Financial Instruments) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financial assets:
Cash and cash equivalents	$ 207,689	$ 142,661
Available for sale debt securities, at fair value	1,102,261	1,063,079
Investment securities held to maturity, fair value	487,921	479,740
Federal Home Loan Bank stock	74,863	68,813
Equity securities	750	635
Loans, net of allowance for loan losses	7,230,925	7,195,026
Financial liabilities:
Certificates of deposit	778,409	750,492
Total deposits	6,874,971	6,830,122
Borrowed funds	1,512,248	1,442,282
Derivative liabilities	35,300
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	207,689	142,661
Available for sale debt securities, at fair value	0	0
Investment securities held to maturity, fair value	4,622	4,896
Federal Home Loan Bank stock	74,863	68,813
Equity securities	750	635
Loans, net of allowance for loan losses	0	0
Derivative assets	0	0
Financial liabilities:
Deposits other than certificates of deposits	6,096,562	6,079,630
Certificates of deposit	0	0
Total deposits	6,096,562	6,079,630
Borrowed funds	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	1,102,261	1,063,079
Investment securities held to maturity, fair value	483,299	474,844
Federal Home Loan Bank stock	0	0
Equity securities	0	0
Loans, net of allowance for loan losses	0	0
Derivative assets	33,584	15,634
Financial liabilities:
Deposits other than certificates of deposits	0	0
Certificates of deposit	776,789	746,753
Total deposits	776,789	746,753
Borrowed funds	1,512,829	1,431,001
Derivative liabilities	36,104	14,766
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 loan losses	7,237,101	7,104,380
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
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		0
Investment securities held to maturity, fair value	4,622	4,896
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	1,072,761	1,034,969
Investment securities held to maturity, fair value	155	190
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	1,072,761	1,034,969
Investment securities held to maturity, fair value	155	190
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
State And Municipal Obligations
Financial assets:
Available for sale debt securities, at fair value	4,103	2,912
Investment securities held to maturity, fair value	472,149	464,363
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	4,103	2,912
Investment securities held to maturity, fair value	472,149	464,363
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	25,397	25,198
Investment securities held to maturity, fair value	10,995	10,291
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	25,397	25,198
Investment securities held to maturity, fair value	10,995	10,291
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	207,689	142,661
Available for sale debt securities, at fair value	1,102,261	1,063,079
Investment securities held to maturity, fair value	474,855	479,425
Federal Home Loan Bank stock	74,863	68,813
Equity securities	750	635
Loans, net of allowance for loan losses	7,230,925	7,195,026
Derivative assets	33,584	15,634
Financial liabilities:
Deposits other than certificates of deposits	6,096,562	6,079,630
Certificates of deposit	778,409	750,492
Total deposits	6,874,971	6,830,122
Borrowed funds	1,512,248	1,442,282
Derivative liabilities	36,104	14,766
Carrying Value \| Agency Obligations
Financial assets:
Available for sale debt securities, at fair value		0
Investment securities held to maturity, fair value	4,622	4,989
Carrying Value \| Mortgage-Backed Securities
Financial assets:
Available for sale debt securities, at fair value	1,072,761	1,034,969
Investment securities held to maturity, fair value	151	187
Carrying Value \| State And Municipal Obligations
Financial assets:
Available for sale debt securities, at fair value	4,103	2,912
Investment securities held to maturity, fair value	459,105	463,801
Carrying Value \| Corporate Obligations
Financial assets:
Available for sale debt securities, at fair value	25,397	25,198
Investment securities held to maturity, fair value	10,977	10,448
Fair Value
Financial assets:
Cash and cash equivalents	207,689	142,661
Available for sale debt securities, at fair value	1,102,261	1,063,079
Investment securities held to maturity, fair value	487,921	479,740
Federal Home Loan Bank stock	74,863	68,813
Equity securities	750	635
Loans, net of allowance for loan losses	7,237,101	7,104,380
Derivative assets	33,584	15,634
Financial liabilities:
Deposits other than certificates of deposits	6,096,562	6,079,630
Certificates of deposit	776,789	746,753
Total deposits	6,873,351	6,826,383
Borrowed funds	1,512,829	1,431,001
Derivative liabilities	36,104	14,766
Fair Value \| Agency Obligations
Financial assets:
Available for sale debt securities, at fair value		0
Investment securities held to maturity, fair value	4,622	4,896
Fair Value \| Mortgage-Backed Securities
Financial assets:
Available for sale debt securities, at fair value	1,072,761	1,034,969
Investment securities held to maturity, fair value	155	190
Fair Value \| State And Municipal Obligations
Financial assets:
Available for sale debt securities, at fair value	4,103	2,912
Investment securities held to maturity, fair value	472,149	464,363
Fair Value \| Corporate Obligations
Financial assets:
Available for sale debt securities, at fair value	25,397	25,198
Investment securities held to maturity, fair value	$ 10,995	$ 10,291

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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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