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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Securities available for sale    
Investment securities available for sale $ 1,815,504 $ 1,891,016
Forward Contracts [Member]    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 67 19
Equity Securities [Member]    
Securities available for sale    
Investment securities available for sale [1] 0 418
U S Treasury Securities [Member]    
Securities available for sale    
Investment securities available for sale 57,169 7,401
Us Government Agencies Debt Securities Noncallable [Member]    
Securities available for sale    
Investment securities available for sale 329,170 361,971
Us Government Agencies Debt Securities Callable [Member]    
Securities available for sale    
Investment securities available for sale 1,406,283 1,497,253
US States And Political Subdivisions Member [Member]    
Securities available for sale    
Investment securities available for sale 6,808 6,813
Private Label Mbs [Member]    
Securities available for sale    
Investment securities available for sale 16,074 17,060
Interest Rate Cap [Member] | Purchase    
Derivatives, included in assets:    
Derivatives, included in assets 668 305
Interest Rate Cap [Member] | Written    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 668 305
Forward And Future Contracts [Member]    
Derivatives, included in assets:    
Derivatives, included in assets 3 7
Other Available For Sale Securities [Member]    
Securities available for sale    
Investment securities available for sale 0 100
Other investments [Member]    
other investment    
Other investments [1] 413 0
Fair Value Inputs Level 1 [Member]    
other investment    
Other investments 413  
Fair Value Inputs Level 1 [Member] | Forward Contracts [Member]    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 0 0
Fair Value Inputs Level 1 [Member] | Equity Securities [Member]    
Securities available for sale    
Investment securities available for sale [1] 0 418
Fair Value Inputs Level 1 [Member] | U S Treasury Securities [Member]    
Securities available for sale    
Investment securities available for sale 57,169 7,401
Fair Value Inputs Level 1 [Member] | Us Government Agencies Debt Securities Noncallable [Member]    
Securities available for sale    
Investment securities available for sale 0 0
Fair Value Inputs Level 1 [Member] | Us Government Agencies Debt Securities Callable [Member]    
Securities available for sale    
Investment securities available for sale 0 0
Fair Value Inputs Level 1 [Member] | US States And Political Subdivisions Member [Member]    
Securities available for sale    
Investment securities available for sale 0 0
Fair Value Inputs Level 1 [Member] | Private Label Mbs [Member]    
Securities available for sale    
Investment securities available for sale 0 0
Fair Value Inputs Level 1 [Member] | Interest Rate Cap [Member] | Purchase    
Derivatives, included in assets:    
Derivatives, included in assets 0 0
Fair Value Inputs Level 1 [Member] | Interest Rate Cap [Member] | Written    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 0 0
Fair Value Inputs Level 1 [Member] | Forward And Future Contracts [Member]    
Derivatives, included in assets:    
Derivatives, included in assets 0 0
Fair Value Inputs Level 1 [Member] | Other Available For Sale Securities [Member]    
Securities available for sale    
Investment securities available for sale 0 0
Fair Value Inputs Level 1 [Member] | Other investments [Member]    
other investment    
Other investments [1] 413 0
Fair Value Inputs Level 2 [Member]    
other investment    
Other investments 0  
Fair Value Inputs Level 2 [Member] | Forward Contracts [Member]    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 67 19
Fair Value Inputs Level 2 [Member] | Equity Securities [Member]    
Securities available for sale    
Investment securities available for sale [1] 0 0
Fair Value Inputs Level 2 [Member] | U S Treasury Securities [Member]    
Securities available for sale    
Investment securities available for sale 0 0
Fair Value Inputs Level 2 [Member] | Us Government Agencies Debt Securities Noncallable [Member]    
Securities available for sale    
Investment securities available for sale 329,170 361,971
Fair Value Inputs Level 2 [Member] | Us Government Agencies Debt Securities Callable [Member]    
Securities available for sale    
Investment securities available for sale 1,406,283 1,497,253
Fair Value Inputs Level 2 [Member] | US States And Political Subdivisions Member [Member]    
Securities available for sale    
Investment securities available for sale 4,074 4,118
Fair Value Inputs Level 2 [Member] | Private Label Mbs [Member]    
Securities available for sale    
Investment securities available for sale 0 0
Fair Value Inputs Level 2 [Member] | Interest Rate Cap [Member] | Purchase    
Derivatives, included in assets:    
Derivatives, included in assets 668 305
Fair Value Inputs Level 2 [Member] | Interest Rate Cap [Member] | Written    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 668 305
Fair Value Inputs Level 2 [Member] | Forward And Future Contracts [Member]    
Derivatives, included in assets:    
Derivatives, included in assets 3 7
Fair Value Inputs Level 2 [Member] | Other Available For Sale Securities [Member]    
Securities available for sale    
Investment securities available for sale 0 0
Fair Value Inputs Level 2 [Member] | Other investments [Member]    
other investment    
Other investments [1] 0 0
Fair Value Inputs Level 3 [Member]    
other investment    
Other investments 0  
Fair Value Inputs Level 3 [Member] | Forward Contracts [Member]    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 0 0
Fair Value Inputs Level 3 [Member] | Equity Securities [Member]    
Securities available for sale    
Investment securities available for sale [1] 0 0
Fair Value Inputs Level 3 [Member] | U S Treasury Securities [Member]    
Securities available for sale    
Investment securities available for sale 0 0
Fair Value Inputs Level 3 [Member] | Us Government Agencies Debt Securities Noncallable [Member]    
Securities available for sale    
Investment securities available for sale 0 0
Fair Value Inputs Level 3 [Member] | Us Government Agencies Debt Securities Callable [Member]    
Securities available for sale    
Investment securities available for sale 0 0
Fair Value Inputs Level 3 [Member] | US States And Political Subdivisions Member [Member]    
Securities available for sale    
Investment securities available for sale 2,734 2,695
Fair Value Inputs Level 3 [Member] | Private Label Mbs [Member]    
Securities available for sale    
Investment securities available for sale 16,074 17,060
Fair Value Inputs Level 3 [Member] | Interest Rate Cap [Member] | Purchase    
Derivatives, included in assets:    
Derivatives, included in assets 0 0
Fair Value Inputs Level 3 [Member] | Interest Rate Cap [Member] | Written    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 0 0
Fair Value Inputs Level 3 [Member] | Forward And Future Contracts [Member]    
Derivatives, included in assets:    
Derivatives, included in assets 0 0
Fair Value Inputs Level 3 [Member] | Other Available For Sale Securities [Member]    
Securities available for sale    
Investment securities available for sale 0 100
Fair Value Inputs Level 3 [Member] | Other investments [Member]    
other investment    
Other investments [1] $ 0 $ 0
[1]
As of January 1, 2018, the Corporation adopted ASU 2016-01, resulting in the reclassification of equity securities from available-for-sale investment securities to other investment securities. As of December 31, 2017, equity securities had a net unrealized loss of $6 thousand.