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Fair Value Measurement - Carrying Values and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
ASSETS |  |  |
Securities available-for-sale |  | $ 713,198 | $ 693,487
Portfolio loans, net | [1] | 5,691,010 | 5,558,644
FHLB and other restricted stock |  | 29,739 | 31,817
LIABILITIES |  |  |
Junior subordinated debt securities |  | 45,619 | 45,619
Carrying Value |  |  |
ASSETS |  |  |
Cash and due from banks, including interest-bearing deposits | [1] | 104,705 | 139,486
Securities available-for-sale | [1] | 713,198 | 693,487
Loans held for sale | [1] | 14,355 | 3,793
Bank owned life insurance | [1] | 72,574 | 72,081
FHLB and other restricted stock | [1] | 29,739 | 31,817
Trading securities held in a Rabbi Trust | [1] | 4,674 | 4,410
Mortgage servicing rights | [1] | 3,784 | 3,744
LIABILITIES |  |  |
Deposits | [1] | 5,435,325 | 5,272,377
Securities sold under repurchase agreements | [1] | 46,987 | 50,832
Short-term borrowings | [1] | 610,000 | 660,000
Long-term borrowings | [1] | 14,118 | 14,713
Junior subordinated debt securities | [1] | 45,619 | 45,619
Carrying Value | Interest rate swap contracts - commercial loans |  |  |
ASSETS |  |  |
Derivative financial assets | [1] | 5,379 | 6,960
LIABILITIES |  |  |
Derivative financial liabilities | [1] | 5,352 | 6,958
Carrying Value | Interest rate lock commitments - mortgage loans |  |  |
ASSETS |  |  |
Derivative financial assets | [1] | 469 | 236
Carrying Value | Forward sale contracts - mortgage loans |  |  |
LIABILITIES |  |  |
Derivative financial liabilities | [1] | 63 | 27
Fair Value Measurements |  |  |
ASSETS |  |  |
Cash and due from banks, including interest-bearing deposits |  | 104,705 | 139,486
Securities available-for-sale |  | 713,198 | 693,487
Loans held for sale |  | 14,355 | 3,815
Portfolio loans, net |  | 5,684,049 | 5,551,266
Bank owned life insurance |  | 72,574 | 72,081
FHLB and other restricted stock |  | 29,739 | 31,817
Trading securities held in a Rabbi Trust |  | 4,674 | 4,410
Mortgage servicing rights |  | 4,256 | 4,098
LIABILITIES |  |  |
Deposits |  | 5,439,713 | 5,276,499
Securities sold under repurchase agreements |  | 46,987 | 50,832
Short-term borrowings |  | 610,000 | 660,000
Long-term borrowings |  | 14,603 | 15,267
Junior subordinated debt securities |  | 45,619 | 45,619
Fair Value Measurements | Interest rate swap contracts - commercial loans |  |  |
ASSETS |  |  |
Derivative financial assets |  | 5,379 | 6,960
LIABILITIES |  |  |
Derivative financial liabilities |  | 5,352 | 6,958
Fair Value Measurements | Interest rate lock commitments - mortgage loans |  |  |
ASSETS |  |  |
Derivative financial assets |  | 469 | 236
Fair Value Measurements | Forward sale contracts - mortgage loans |  |  |
LIABILITIES |  |  |
Derivative financial liabilities |  | 63 | 27
Fair Value Measurements | Level 1 |  |  |
ASSETS |  |  |
Cash and due from banks, including interest-bearing deposits |  | 104,705 | 139,486
Securities available-for-sale |  | 0 | 0
Loans held for sale |  | 0 | 0
Portfolio loans, net |  | 0 | 0
Bank owned life insurance |  | 0 | 0
FHLB and other restricted stock |  | 0 | 0
Trading securities held in a Rabbi Trust |  | 4,674 | 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 swap contracts - commercial loans |  |  |
ASSETS |  |  |
Derivative financial assets |  | 0 | 0
LIABILITIES |  |  |
Derivative financial liabilities |  | 0 | 0
Fair Value Measurements | Level 1 | Interest rate lock commitments - mortgage loans |  |  |
ASSETS |  |  |
Derivative financial assets |  | 0 | 0
Fair Value Measurements | Level 1 | Forward sale contracts - mortgage loans |  |  |
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 |  | 713,198 | 693,487
Loans held for sale |  | 0 | 0
Portfolio loans, net |  | 0 | 0
Bank owned life insurance |  | 72,574 | 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 swap contracts - commercial loans |  |  |
ASSETS |  |  |
Derivative financial assets |  | 5,379 | 6,960
LIABILITIES |  |  |
Derivative financial liabilities |  | 5,352 | 6,958
Fair Value Measurements | Level 2 | Interest rate lock commitments - mortgage loans |  |  |
ASSETS |  |  |
Derivative financial assets |  | 469 | 236
Fair Value Measurements | Level 2 | Forward sale contracts - mortgage loans |  |  |
LIABILITIES |  |  |
Derivative financial liabilities |  | 63 | 27
Fair Value Measurements | Level 3 |  |  |
ASSETS |  |  |
Cash and due from banks, including interest-bearing deposits |  | 0 | 0
Securities available-for-sale |  | 0 | 0
Loans held for sale |  | 14,355 | 3,815
Portfolio loans, net |  | 5,684,049 | 5,551,266
Bank owned life insurance |  | 0 | 0
FHLB and other restricted stock |  | 29,739 | 31,817
Trading securities held in a Rabbi Trust |  | 0 | 0
Mortgage servicing rights |  | 4,256 | 4,098
LIABILITIES |  |  |
Deposits |  | 5,439,713 | 5,276,499
Securities sold under repurchase agreements |  | 46,987 | 50,832
Short-term borrowings |  | 610,000 | 660,000
Long-term borrowings |  | 14,603 | 15,267
Junior subordinated debt securities |  | 45,619 | 45,619
Fair Value Measurements | Level 3 | Interest rate swap contracts - commercial loans |  |  |
ASSETS |  |  |
Derivative financial assets |  | 0 | 0
LIABILITIES |  |  |
Derivative financial liabilities |  | 0 | 0
Fair Value Measurements | Level 3 | Interest rate lock commitments - mortgage loans |  |  |
ASSETS |  |  |
Derivative financial assets |  | 0 | 0
Fair Value Measurements | Level 3 | Forward sale contracts - mortgage loans |  |  |
LIABILITIES |  |  |
Derivative financial liabilities |  | $ 0 | $ 0
[1] | As reported in the Consolidated Balance Sheets.

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + 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 + Details
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- Definition Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Surrender Value -URI http://asc.fasb.org/extlink&oid=6507153 + Details
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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=73719730&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=73719730&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=51825145&loc=SL20226008-175313 + Details
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- Definition Including the current and noncurrent portions, 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. + References Reference 1: 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(16)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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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