Fair Value Measurements (Details 7) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Assets:
Cash and due from banks		$ 73,635	$ 58,578
Federal funds sold and interest bearing deposits with other banks		4,398	49,726
Investment securities, available-for-sale		904,033	850,467
Mortgages held for sale		13,123	15,849
Loans and leases, net of reserve for loan and lease losses		4,432,795	4,099,528
Liabilities:
Long-term debt and mandatorily redeemable securities		70,060	74,308
Subordinated notes		58,764	58,764
Carrying or Contract Value
Assets:
Cash and due from banks		73,635	58,578
Federal funds sold and interest bearing deposits with other banks		4,398	49,726
Investment securities, available-for-sale		904,033	850,467
Other investments and trading account securities		25,953	22,458
Mortgages held for sale		13,123	15,849
Loans and leases, net of reserve for loan and lease losses		4,432,795	4,099,528
Mortgage servicing rights		4,349	4,297
Interest rate swaps		5,167	6,621
Liabilities:
Deposits		4,752,730	4,333,760
Short-term borrowings		214,595	291,943
Long-term debt and mandatorily redeemable securities		70,060	74,308
Subordinated notes		58,764	58,764
Interest rate swaps		5,262	6,743
Off-balance-sheet instruments	[1]	0	0
Fair Value
Assets:
Cash and due from banks		73,635	58,578
Federal funds sold and interest bearing deposits with other banks		4,398	49,726
Investment securities, available-for-sale		904,033	850,467
Other investments and trading account securities		25,953	22,458
Mortgages held for sale		13,123	15,849
Loans and leases, net of reserve for loan and lease losses		4,428,848	4,107,079
Mortgage servicing rights		7,187	7,484
Interest rate swaps		5,167	6,621
Liabilities:
Deposits		4,745,111	4,332,744
Short-term borrowings		214,595	291,943
Long-term debt and mandatorily redeemable securities		67,857	73,149
Subordinated notes		57,103	51,031
Interest rate swaps		5,262	6,743
Off-balance-sheet instruments	[1]	286	382
Level 1
Assets:
Cash and due from banks		73,635	58,578
Federal funds sold and interest bearing deposits with other banks		4,398	49,726
Investment securities, available-for-sale		27,971	28,366
Other investments and trading account securities		25,953	22,458
Mortgages held for sale		0	0
Loans and leases, net of reserve for loan and lease losses		0	0
Mortgage servicing rights		0	0
Interest rate swaps		0	0
Liabilities:
Deposits		3,482,757	3,277,108
Short-term borrowings		206,862	163,652
Long-term debt and mandatorily redeemable securities		0	0
Subordinated notes		0	0
Interest rate swaps		0	0
Off-balance-sheet instruments	[1]	0	0
Level 2
Assets:
Cash and due from banks		0	0
Federal funds sold and interest bearing deposits with other banks		0	0
Investment securities, available-for-sale		873,197	818,595
Other investments and trading account securities		0	0
Mortgages held for sale		13,123	15,849
Loans and leases, net of reserve for loan and lease losses		0	0
Mortgage servicing rights		0	0
Interest rate swaps		5,167	6,621
Liabilities:
Deposits		1,262,354	1,055,636
Short-term borrowings		7,733	128,291
Long-term debt and mandatorily redeemable securities		67,857	73,149
Subordinated notes		57,103	51,031
Interest rate swaps		5,262	6,743
Off-balance-sheet instruments	[1]	286	382
Level 3
Assets:
Cash and due from banks		0	0
Federal funds sold and interest bearing deposits with other banks		0	0
Investment securities, available-for-sale		2,865	3,506
Other investments and trading account securities		0	0
Mortgages held for sale		0	0
Loans and leases, net of reserve for loan and lease losses		4,428,848	4,107,079
Mortgage servicing rights		7,187	7,484
Interest rate swaps		0	0
Liabilities:
Deposits		0	0
Short-term borrowings		0	0
Long-term debt and mandatorily redeemable securities		0	0
Subordinated notes		0	0
Interest rate swaps		0	0
Off-balance-sheet instruments	[1]	$ 0	$ 0

[1] Represents estimated cash outflows required to currently settle the obligations at current market rates.