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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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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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.

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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.

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Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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