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Fair Values of Assets and Liabilities - Schedule of Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | $ (909,247) | $ (731,358)
Assets, Fair Value Disclosure | 957,719 | 779,966
Balance, beginning of period | 27,459 | 35,892
Total gains or losses included in earnings | 8,102 | 4,329
Total gains or losses included in other comprehensive income | (118) | 3,725
Purchases | 601 | 1,213
Issuances | 0 | 0
Sales | (12,289) | 0
Settlements | (19,389) | (17,700)
Transfers from Level 3 | 0 | 0
Transfers into Level 3 | 0 | 0
Balance, end of period | 4,366 | 27,459
Other Investments | 32,126 | 29,837
Loans Held-for-sale, Fair Value Disclosure | 11,881 | 14,850
Other Assets, Fair Value Disclosure | 4,465 | 3,921
Other Liabilities, Fair Value Disclosure | 2,081 | 3,079
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 2,081 | 3,079
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period | 23,646 | 33,292
Total gains or losses included in earnings | 8,102 | 4,329
Total gains or losses included in other comprehensive income | (118) | 3,725
Purchases | 0 | 0
Issuances | 0 | 0
Sales | (12,289) | 0
Settlements | (19,341) | (17,700)
Transfers from Level 3 | 0 | 0
Transfers into Level 3 | 0 | 0
Balance, end of period | 0 | 23,646
Equity Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period | 1,670 | 1,670
Total gains or losses included in earnings | 0 | 0
Total gains or losses included in other comprehensive income | 0 | 0
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Transfers from Level 3 | 0 | 0
Transfers into Level 3 | 0 | 0
Balance, end of period | 1,670 | 1,670
Other Assets [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period | 2,143 | 930
Total gains or losses included in earnings | 0 | 0
Total gains or losses included in other comprehensive income | 0 | 0
Purchases | 601 | 1,213
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 48 | 0
Transfers from Level 3 | 0 | 0
Transfers into Level 3 | 0 |
Balance, end of period | 2,696 | 2,143
Corporate Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | (21,012) | (16,493)
Debt Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value |  | (729,688)
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value |  | (23,646)
US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | (9,406) | (11,338)
US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Commercial [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | (167,744) | (24,149)
Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | (673,361) | (625,555)
Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government - Sponsored Enterprises [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | (10,012) | (1,097)
Obligations of States and Political Subdivisions [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | (27,712) | (27,410)
Equity Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | 0 | (1,670)
Level 1 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | 0 | 0
Assets, Fair Value Disclosure | 0 | 0
Other Investments | 0 |
Loans Held-for-sale, Fair Value Disclosure | 0 | 0
Other Assets, Fair Value Disclosure | 0 | 0
Other Liabilities, Fair Value Disclosure | 0 | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 | 0
Level 1 [Member] | Corporate Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | 0 | 0
Level 1 [Member] | Debt Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value |  | 0
Level 1 [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value |  | 0
Level 1 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | 0 | 0
Level 1 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Commercial [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | 0 | 0
Level 1 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | 0 | 0
Level 1 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government - Sponsored Enterprises [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | 0 | 0
Level 1 [Member] | Obligations of States and Political Subdivisions [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | 0 | 0
Level 1 [Member] | Equity Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value |  | 0
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | (909,247) | (706,042)
Assets, Fair Value Disclosure | 953,353 | 752,507
Other Investments | 30,456 |
Loans Held-for-sale, Fair Value Disclosure | 11,881 | 14,850
Other Assets, Fair Value Disclosure | 1,769 | 1,778
Other Liabilities, Fair Value Disclosure | 2,081 | 3,079
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 2,081 | 3,079
Fair Value, Inputs, Level 2 [Member] | Corporate Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | (21,012) | (16,493)
Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value |  | (706,042)
Fair Value, Inputs, Level 2 [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value |  | 0
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | (9,406) | (11,338)
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Commercial [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | (167,744) | (24,149)
Fair Value, Inputs, Level 2 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | (673,361) | (625,555)
Fair Value, Inputs, Level 2 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government - Sponsored Enterprises [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | (10,012) | (1,097)
Fair Value, Inputs, Level 2 [Member] | Obligations of States and Political Subdivisions [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | (27,712) | (27,410)
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value |  | 0
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | 0 | (25,316)
Assets, Fair Value Disclosure | 4,366 | 27,459
Loans Held-for-sale, Fair Value Disclosure | 0 | 0
Other Assets, Fair Value Disclosure | 2,696 | 2,143
Other Liabilities, Fair Value Disclosure | 0 | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Other Investments | 1,670 |
Fair Value, Inputs, Level 3 [Member] | Corporate Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value |  | (23,646)
Fair Value, Inputs, Level 3 [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value |  | (23,646)
Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Commercial [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government - Sponsored Enterprises [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Obligations of States and Political Subdivisions [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value | $ 0 | 0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale, at fair value |  | $ (1,670)

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Data Type: | na
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