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Fair Value Measurements - Carrying Values and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
ASSETS |  |  |  |
Securities available-for-sale, at fair value |  | $ 698,291 | $ 693,487 |
FHLB and other restricted stock |  | 29,270 | 31,817 |
LIABILITIES |  |  |  |
Junior subordinated debt securities |  | 45,619 | 45,619 | $ 45,619
Carrying Value |  |  |  |
ASSETS |  |  |  |
Cash and due from banks, including interest-bearing deposits | [1] | 117,152 | 139,486 |
Securities available-for-sale, at fair value | [1] | 698,291 | 693,487 |
Loans held for sale | [1] | 4,485 | 3,793 |
Portfolio loans, net of unearned income | [1] | 5,761,449 | 5,611,419 |
Bank owned life insurance | [1] | 72,150 | 72,081 |
FHLB and other restricted stock | [1] | 29,270 | 31,817 |
Trading securities held in a Rabbi Trust | [1] | 5,080 | 4,410 |
Mortgage servicing rights | [1] | 4,133 | 3,744 |
LIABILITIES |  |  |  |
Deposits | [1] | 5,427,891 | 5,272,377 |
Securities sold under repurchase agreements | [1] | 50,161 | 50,832 |
Short-term borrowings | [1] | 540,000 | 660,000 |
Long-term borrowings | [1] | 47,301 | 14,713 |
Junior subordinated debt securities | [1] | 45,619 | 45,619 |
Carrying Value | Interest rate swaps |  |  |  |
ASSETS |  |  |  |
Derivative financial assets | [1] | 3,074 | 6,960 |
LIABILITIES |  |  |  |
Derivative financial liabilities | [1] | 3,055 | 6,958 |
Carrying Value | Interest rate lock commitments |  |  |  |
ASSETS |  |  |  |
Derivative financial assets | [1] | 226 | 236 |
Carrying Value | Forward sale contracts |  |  |  |
LIABILITIES |  |  |  |
Derivative financial liabilities | [1] | 5 | 27 |
Fair Value Measurements |  |  |  |
ASSETS |  |  |  |
Cash and due from banks, including interest-bearing deposits |  | 117,152 | 139,486 |
Securities available-for-sale, at fair value |  | 698,291 | 693,487 |
Loans held for sale |  | 4,583 | 3,815 |
Portfolio loans, net of unearned income |  | 5,690,292 | 5,551,266 |
Bank owned life insurance |  | 72,150 | 72,081 |
FHLB and other restricted stock |  | 29,270 | 31,817 |
Trading securities held in a Rabbi Trust |  | 5,080 | 4,410 |
Mortgage servicing rights |  | 4,571 | 4,098 |
LIABILITIES |  |  |  |
Deposits |  | 5,426,928 | 5,276,499 |
Securities sold under repurchase agreements |  | 50,161 | 50,832 |
Short-term borrowings |  | 540,000 | 660,000 |
Long-term borrowings |  | 47,618 | 15,267 |
Junior subordinated debt securities |  | 45,619 | 45,619 |
Fair Value Measurements | Interest rate swaps |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | 3,074 | 6,960 |
LIABILITIES |  |  |  |
Derivative financial liabilities |  | 3,055 | 6,958 |
Fair Value Measurements | Interest rate lock commitments |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | 226 | 236 |
Fair Value Measurements | Forward sale contracts |  |  |  |
LIABILITIES |  |  |  |
Derivative financial liabilities |  | 5 | 27 |
Fair Value Measurements | Level 1 |  |  |  |
ASSETS |  |  |  |
Cash and due from banks, including interest-bearing deposits |  | 117,152 | 139,486 |
Securities available-for-sale, at fair value |  | 0 | 0 |
Loans held for sale |  | 0 | 0 |
Portfolio loans, net of unearned income |  | 0 | 0 |
Bank owned life insurance |  | 0 | 0 |
FHLB and other restricted stock |  | 0 | 0 |
Trading securities held in a Rabbi Trust |  | 5,080 | 4,410 |
Mortgage servicing rights |  | 0 | 0 |
LIABILITIES |  |  |  |
Deposits |  | 0 | 0 |
Securities sold under repurchase agreements |  | 0 | 0 |
Short-term borrowings |  | 0 | 0 |
Long-term borrowings |  | 0 | 0 |
Junior subordinated debt securities |  | 0 | 0 |
Fair Value Measurements | Level 1 | Interest rate swaps |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | 0 | 0 |
LIABILITIES |  |  |  |
Derivative financial liabilities |  | 0 | 0 |
Fair Value Measurements | Level 1 | Interest rate lock commitments |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | 0 | 0 |
Fair Value Measurements | Level 1 | Forward sale contracts |  |  |  |
LIABILITIES |  |  |  |
Derivative financial liabilities |  | 0 | 0 |
Fair Value Measurements | Level 2 |  |  |  |
ASSETS |  |  |  |
Cash and due from banks, including interest-bearing deposits |  | 0 | 0 |
Securities available-for-sale, at fair value |  | 698,291 | 693,487 |
Loans held for sale |  | 0 | 0 |
Portfolio loans, net of unearned income |  | 0 | 0 |
Bank owned life insurance |  | 72,150 | 72,081 |
FHLB and other restricted stock |  | 0 | 0 |
Trading securities held in a Rabbi Trust |  | 0 | 0 |
Mortgage servicing rights |  | 0 | 0 |
LIABILITIES |  |  |  |
Deposits |  | 0 | 0 |
Securities sold under repurchase agreements |  | 0 | 0 |
Short-term borrowings |  | 0 | 0 |
Long-term borrowings |  | 0 | 0 |
Junior subordinated debt securities |  | 0 | 0 |
Fair Value Measurements | Level 2 | Interest rate swaps |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | 3,074 | 6,960 |
LIABILITIES |  |  |  |
Derivative financial liabilities |  | 3,055 | 6,958 |
Fair Value Measurements | Level 2 | Interest rate lock commitments |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | 226 | 236 |
Fair Value Measurements | Level 2 | Forward sale contracts |  |  |  |
LIABILITIES |  |  |  |
Derivative financial liabilities |  | 5 | 27 |
Fair Value Measurements | Level 3 |  |  |  |
ASSETS |  |  |  |
Cash and due from banks, including interest-bearing deposits |  | 0 | 0 |
Securities available-for-sale, at fair value |  | 0 | 0 |
Loans held for sale |  | 4,583 | 3,815 |
Portfolio loans, net of unearned income |  | 5,690,292 | 5,551,266 |
Bank owned life insurance |  | 0 | 0 |
FHLB and other restricted stock |  | 29,270 | 31,817 |
Trading securities held in a Rabbi Trust |  | 0 | 0 |
Mortgage servicing rights |  | 4,571 | 4,098 |
LIABILITIES |  |  |  |
Deposits |  | 5,426,928 | 5,276,499 |
Securities sold under repurchase agreements |  | 50,161 | 50,832 |
Short-term borrowings |  | 540,000 | 660,000 |
Long-term borrowings |  | 47,618 | 15,267 |
Junior subordinated debt securities |  | 45,619 | 45,619 |
Fair Value Measurements | Level 3 | Interest rate swaps |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | 0 | 0 |
LIABILITIES |  |  |  |
Derivative financial liabilities |  | 0 | 0 |
Fair Value Measurements | Level 3 | Interest rate lock commitments |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | 0 | 0 |
Fair Value Measurements | Level 3 | Forward sale contracts |  |  |  |
LIABILITIES |  |  |  |
Derivative financial liabilities |  | $ 0 | $ 0 |
[1] | As reported in the Consolidated Balance Sheets

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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- Definition Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments, excluding current portion. + 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 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- Definition Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet. + References No definition available. + Details
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- Definition Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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