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Fair Value Measurement of Assets and Liabilities - Schedule of Assets and Liabilities Measured at Fair Value on Recurring and Non-Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Assets    
Available for sale $ 1,506,861 $ 886,970
Trading securities 0 14,233
Liabilities    
Foreclosed assets 19,000 24,700
Loans held for sale (which consist of residential mortgages) carried at fair value 16,100 16,900
Covered other real estate 4,200 3,200
U.S. Treasury securities [Member]    
Assets    
Available for sale 549,473 49,443
U.S. government agency securities [Member]    
Assets    
Available for sale 29,963 33,825
Obligations of states and political subdivisions [Member]    
Assets    
Available for sale 124,966 44,051
Residential mortgage-backed securities [Member]    
Assets    
Available for sale 696,428 644,276
Trust preferred securities [Member]    
Assets    
Available for sale [1] 8,404 20,537
Corporate and other debt securities [Member]    
Assets    
Available for sale 77,552 74,012
Equity securities [Member]    
Assets    
Available for sale 20,075 20,826
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. government agency securities [Member]    
Assets    
Available for sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]    
Assets    
Available for sale 568,381 69,021
Trading securities   0
Loans held for sale [2] 0 0
Other assets [3] 0 0
Total assets 568,381 69,021
Liabilities    
Other liabilities [3] 0 0
Total liabilities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member] | U.S. Treasury securities [Member]    
Assets    
Available for sale 549,473 49,443
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member] | Obligations of states and political subdivisions [Member]    
Assets    
Available for sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member] | Residential mortgage-backed securities [Member]    
Assets    
Available for sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member] | Trust preferred securities [Member]    
Assets    
Available for sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member] | Corporate and other debt securities [Member]    
Assets    
Available for sale 17,710 18,241
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member] | Equity securities [Member]    
Assets    
Available for sale 1,198 1,337
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Non-Recurring Fair Value Measurements [Member]    
Liabilities    
Non-performing loans held for sale   0
Collateral dependent impaired loans [4] 0 0
Loan servicing rights 0 0
Foreclosed assets [5] 0 0
Total 0 0
Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]    
Assets    
Available for sale 924,687 798,640
Trading securities   14,233
Loans held for sale [2] 16,382 17,165
Other assets [3] 33,774 20,987
Total assets 974,843 851,025
Liabilities    
Other liabilities [3] 50,844 33,330
Total liabilities 50,844 33,330
Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member] | U.S. Treasury securities [Member]    
Assets    
Available for sale 0 0
Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member] | U.S. government agency securities [Member]    
Assets    
Available for sale 29,963 33,825
Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member] | Obligations of states and political subdivisions [Member]    
Assets    
Available for sale 124,966 44,051
Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member] | Residential mortgage-backed securities [Member]    
Assets    
Available for sale 684,777 629,696
Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member] | Trust preferred securities [Member]    
Assets    
Available for sale 6,262 15,808
Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member] | Corporate and other debt securities [Member]    
Assets    
Available for sale 59,842 55,771
Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member] | Equity securities [Member]    
Assets    
Available for sale 18,877 19,489
Significant Other Observable Inputs (Level 2) [Member] | Non-Recurring Fair Value Measurements [Member]    
Liabilities    
Non-performing loans held for sale   0
Collateral dependent impaired loans [4] 0 0
Loan servicing rights 0 0
Foreclosed assets [5] 0 0
Total 0 0
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]    
Assets    
Available for sale 13,793 19,309
Trading securities   0
Loans held for sale [2] 0 0
Other assets [3] 0 0
Total assets 13,793 19,309
Liabilities    
Other liabilities [3] 0 0
Total liabilities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | U.S. Treasury securities [Member]    
Assets    
Available for sale 0 0
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | U.S. government agency securities [Member]    
Assets    
Available for sale 0 0
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Obligations of states and political subdivisions [Member]    
Assets    
Available for sale 0 0
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Residential mortgage-backed securities [Member]    
Assets    
Available for sale 11,651 14,580
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Trust preferred securities [Member]    
Assets    
Available for sale 2,142 4,729
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Corporate and other debt securities [Member]    
Assets    
Available for sale 0 0
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Equity securities [Member]    
Assets    
Available for sale 0 0
Significant Unobservable Inputs (Level 3) [Member] | Non-Recurring Fair Value Measurements [Member]    
Liabilities    
Non-performing loans held for sale   7,130
Collateral dependent impaired loans [4] 15,427 13,985
Loan servicing rights 2,571 3,987
Foreclosed assets [5] 16,672 18,098
Total 34,670 43,200
Estimate of Fair Value Measurement [Member] | Recurring Fair Value Measurements [Member]    
Assets    
Available for sale 1,506,861 886,970
Trading securities   14,233
Loans held for sale [2] 16,382 17,165
Other assets [3] 33,774 20,987
Total assets 1,557,017 939,355
Liabilities    
Other liabilities [3] 50,844 33,330
Total liabilities 50,844 33,330
Estimate of Fair Value Measurement [Member] | Recurring Fair Value Measurements [Member] | U.S. Treasury securities [Member]    
Assets    
Available for sale 549,473 49,443
Estimate of Fair Value Measurement [Member] | Recurring Fair Value Measurements [Member] | U.S. government agency securities [Member]    
Assets    
Available for sale 29,963 33,825
Estimate of Fair Value Measurement [Member] | Recurring Fair Value Measurements [Member] | Obligations of states and political subdivisions [Member]    
Assets    
Available for sale 124,966 44,051
Estimate of Fair Value Measurement [Member] | Recurring Fair Value Measurements [Member] | Residential mortgage-backed securities [Member]    
Assets    
Available for sale 696,428 644,276
Estimate of Fair Value Measurement [Member] | Recurring Fair Value Measurements [Member] | Trust preferred securities [Member]    
Assets    
Available for sale 8,404 20,537
Estimate of Fair Value Measurement [Member] | Recurring Fair Value Measurements [Member] | Corporate and other debt securities [Member]    
Assets    
Available for sale 77,552 74,012
Estimate of Fair Value Measurement [Member] | Recurring Fair Value Measurements [Member] | Equity securities [Member]    
Assets    
Available for sale 20,075 20,826
Estimate of Fair Value Measurement [Member] | Non-Recurring Fair Value Measurements [Member]    
Liabilities    
Non-performing loans held for sale   7,130
Collateral dependent impaired loans [4] 15,427 13,985
Loan servicing rights 2,571 3,987
Foreclosed assets [5] 16,672 18,098
Total $ 34,670 $ 43,200
[1] Includes two and three pooled trust preferred securities, principally collateralized by securities issued by banks and insurance companies, at December 31, 2015 and 2014, respectively.
[2] Loans held for sale (which consist of residential mortgages) are carried at fair value and had contractual unpaid principal balances totaling approximately $16.1 million and $16.9 million at December 31, 2015 and 2014, respectively.
[3] Amount represents derivative financial instruments.
[4] Excludes PCI loans.
[5] Includes covered other real estate owned totaling $4.2 million and $3.2 million at December 31, 2015 and 2014, respectively.