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Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Carrying Amount [Member] |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |
Cash and due from banks | $ 98,319 | $ 91,033
Interest-bearing deposits | 29,709 | 24,644
Securities available for sale, at fair value | 778,644 | 778,612
Held-to-maturity Securities | 436,081 | 372,513
Other investments | 32,302 |
Loans Held for sale, Amount | 17,100 | 7,052
Loans and Leases Receivable, Net of Deferred Income | 5,375,847 | 4,879,347
Deposits | 5,555,057 | 4,947,408
Short-term borrowings | 805,825 | 867,943
Subordinated debt | 72,167 | 72,167
Long-term debt | 8,311 | 8,749
Capital Lease Obligations | 7,677 |
Estimate of Fair Value Measurement [Member] |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |
Cash and due from banks | 98,319 | 91,033
Interest-bearing deposits | 29,709 | 24,644
Securities available for sale, at fair value | 778,644 | 778,612
Held-to-maturity Securities | 434,882 | 368,618
Other investments | 32,302 | 36,498
Loans Held for sale, Amount | 17,100 | 7,052
Loans and Leases Receivable, Net of Deferred Income | 5,403,523 | 4,878,254
Deposits | 5,556,870 | 4,949,714
Short-term borrowings | 805,721 | 867,667
Subordinated debt | 66,779 | 65,656
Long-term debt | 8,805 | 9,169
Capital Lease Obligations | 7,677 |
Estimate of Fair Value Measurement [Member] | Level 1 [Member] |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |
Cash and due from banks | 98,319 | 91,033
Interest-bearing deposits | 29,709 | 24,644
Securities available for sale, at fair value | 0 | 0
Held-to-maturity Securities | 0 | 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
Capital Lease Obligations | 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 | 742,345 | 743,650
Held-to-maturity Securities | 434,882 | 368,618
Other investments | 32,302 | 36,498
Loans Held for sale, Amount | 17,100 | 7,052
Loans and Leases Receivable, Net of Deferred Income | 19,878 | 18,679
Deposits | 5,556,870 | 4,949,714
Short-term borrowings | 805,721 | 867,667
Subordinated debt | 0 | 0
Long-term debt | 8,805 | 9,169
Capital Lease Obligations | 7,677 |
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 | 36,299 | 34,962
Held-to-maturity Securities | 0 | 0
Other investments | 0 | 0
Loans Held for sale, Amount | 0 | 0
Loans and Leases Receivable, Net of Deferred Income | 5,383,645 | 4,859,575
Deposits | 0 | 0
Short-term borrowings | 0 | 0
Subordinated debt | 66,779 | 65,656
Long-term debt | 0 | $ 0
Capital Lease Obligations | $ 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=65884222&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=73527792&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=66010992&loc=d3e26610-111562 + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: 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 3: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + 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 + 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=73527792&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=65884222&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=73527792&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=73530178&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=65884687&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=66008989&loc=d3e5074-111524 + Details
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