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Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Carrying Amount [Member] |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |
Cash and due from banks | $ 68,163 | $ 66,644
Interest-bearing deposits | 30,457 | 2,808
Securities available for sale, at fair value | 855,333 | 886,560
Held-to-maturity Securities | 405,976 |
Other investments | 58,087 |
Loans Held for sale, Amount | 11,613 | 5,763
Loans and Leases Receivable, Net of Deferred Income | 4,843,776 | 4,683,750
Deposits | 4,394,520 | 4,195,894
Short-term borrowings | 1,464,687 | 1,510,825
Subordinated debt | 72,167 | 72,167
Long-term debt | 9,034 | 9,314
Estimate of Fair Value Measurement [Member] |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |
Cash and due from banks | 68,163 | 66,644
Interest-bearing deposits | 30,457 | 2,808
Securities available for sale, at fair value | 855,333 | 886,560
Held-to-maturity Securities | 414,770 |
Other investments | 58,087 | 62,952
Loans Held for sale, Amount | 11,613 | 5,763
Loans and Leases Receivable, Net of Deferred Income | 4,857,127 | 4,690,852
Deposits | 4,395,297 | 4,198,817
Short-term borrowings | 1,464,408 | 1,510,718
Subordinated debt | 61,427 | 62,794
Long-term debt | 10,077 | 9,834
Estimate of Fair Value Measurement [Member] | Level 1 [Member] |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |
Cash and due from banks | 68,163 | 66,644
Interest-bearing deposits | 30,457 | 2,808
Securities available for sale, at fair value | 0 | 0
Held-to-maturity Securities | 0 |
Other investments | 0 | 0
Loans Held for sale, Amount | 0 | 0
Loans and Leases Receivable, Net of Deferred Income | 0 | 0
Deposits | 0 | 0
Short-term borrowings | 0 | 0
Subordinated debt | 0 | 0
Long-term debt | 0 | 0
Estimate of Fair Value Measurement [Member] | Level 2 [Member] |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |
Cash and due from banks | 0 | 0
Interest-bearing deposits | 0 | 0
Securities available for sale, at fair value | 819,940 | 848,732
Held-to-maturity Securities | 414,770 |
Other investments | 58,087 | 62,952
Loans Held for sale, Amount | 11,613 | 5,763
Loans and Leases Receivable, Net of Deferred Income | 30,774 | 30,979
Deposits | 4,395,297 | 4,198,817
Short-term borrowings | 1,464,408 | 1,510,718
Subordinated debt | 0 | 0
Long-term debt | 10,077 | 9,834
Estimate of Fair Value Measurement [Member] | Level 3 [Member] |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |
Cash and due from banks | 0 | 0
Interest-bearing deposits | 0 | 0
Securities available for sale, at fair value | 35,393 | 37,828
Held-to-maturity Securities | 0 |
Other investments | 0 | 0
Loans Held for sale, Amount | 0 | 0
Loans and Leases Receivable, Net of Deferred Income | 4,826,353 | 4,659,873
Deposits | 0 | 0
Short-term borrowings | 0 | 0
Subordinated debt | 61,427 | 62,794
Long-term debt | $ 0 | $ 0

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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=51813488&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=27724398&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=49167202&loc=d3e26610-111562 + Details
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- Definition For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1, 2, 3 -Article 9 + Details
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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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=6478792&loc=d3e63345-112809 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.2) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6476743&loc=d3e59706-112781 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 + Details
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- Definition Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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