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Fair Values of Assets and Liabilities - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | $ 731,358 | $ 778,612
Other investments | 29,837 | 36,498
Loans Held for Sale | 14,850 | 7,052
Other Assets | 3,921 | 7,019
Total Assets | 779,966 | 829,181
Other Liabilities | 3,079 | 5,972
Total Liabilities | 3,079 | 5,972
US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 11,338 | 16,617
US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Commercial [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 24,149 |
Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 625,555 | 676,853
Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Commercial [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 1
Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government - Sponsored Enterprises [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 1,097 | 16,631
Obligations of States and Political Subdivisions [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 27,410 | 27,229
Corporate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 16,493 | 6,319
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 23,646 | 33,292
Corporate Debt Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 729,688 | 776,942
Equity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 1,670 | 1,670
Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Other investments | 0 | 0
Loans Held for Sale | 0 | 0
Other Assets | 0 | 0
Total Assets | 0 | 0
Other Liabilities | 0 | 0
Total Liabilities | 0 | 0
Level 1 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Level 1 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Commercial [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 |
Level 1 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Level 1 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Commercial [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Level 1 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government - Sponsored Enterprises [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Level 1 [Member] | Obligations of States and Political Subdivisions [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Level 1 [Member] | Corporate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Level 1 [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Level 1 [Member] | Corporate Debt Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Level 1 [Member] | Equity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 706,042 | 743,650
Other investments | 29,837 | 36,498
Loans Held for Sale | 14,850 | 7,052
Other Assets | 1,778 | 6,089
Total Assets | 752,507 | 793,289
Other Liabilities | 3,079 | 5,972
Total Liabilities | 3,079 | 5,972
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 11,338 | 16,617
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Commercial [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 24,149 |
Fair Value, Inputs, Level 2 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 625,555 | 676,853
Fair Value, Inputs, Level 2 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Commercial [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 1
Fair Value, Inputs, Level 2 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government - Sponsored Enterprises [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 1,097 | 16,631
Fair Value, Inputs, Level 2 [Member] | Obligations of States and Political Subdivisions [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 27,410 | 27,229
Fair Value, Inputs, Level 2 [Member] | Corporate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 16,493 | 6,319
Fair Value, Inputs, Level 2 [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 706,042 | 743,650
Total Assets | 23,646 |
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 25,316 | 34,962
Other investments | 0 | 0
Loans Held for Sale | 0 | 0
Other Assets | 2,143 | 930
Total Assets | 27,459 | 35,892
Other Liabilities | 0 | 0
Total Liabilities | 0 | 0
Level 3 [Member] | Equity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total Assets | 1,670 |
Level 3 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Level 3 [Member] | US Government Agencies Debt Securities [Member] | Mortgage-Backed Securities-Commercial [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 |
Level 3 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Residential [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Level 3 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage-Backed Securities-Commercial [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Level 3 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government - Sponsored Enterprises [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Level 3 [Member] | Obligations of States and Political Subdivisions [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Level 3 [Member] | Corporate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | 0 | 0
Level 3 [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale | $ 23,646 | 33,292
Level 3 [Member] | Corporate Debt Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale |  | 33,292
Level 3 [Member] | Equity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value of Available for Sale |  | $ 1,670

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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