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Fair Value Measurements - (Details 7) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financial assets
Securities held to maturity	$ 347,977	$ 356,282
Securities available for sale	696,885	674,248
Mortgage loans held for sale	158,619	177,866
Mortgage servicing rights	28,776
Level 1
Financial liabilities
Subordinated notes		0
Level 2
Financial liabilities
Subordinated notes		101,000
Level 3
Financial assets
Mortgage servicing rights		26,302
Financial liabilities
Subordinated notes		0
Carrying Value
Financial assets
Cash and cash equivalents	370,744	306,224
Securities held to maturity	347,977	356,282
Securities available for sale	696,885	674,248
Mortgage loans held for sale	158,619	177,866
Loans, net	6,192,882	6,159,972
Mortgage servicing rights	28,776	26,302
Derivative instruments	6,982	9,108
Financial liabilities
Deposits	7,230,850	7,059,137
Short-term borrowings	9,955	109,676
Other long-term borrowings	135	147
Federal Home Loan Bank advances	8,284	8,542
Junior subordinated debentures	85,470	95,643
Subordinated notes	98,162	98,127
Derivative instruments	6,524	5,910
Fair Value
Financial assets
Cash and cash equivalents	370,744	306,224
Securities held to maturity	357,216	362,893
Securities available for sale	696,885	674,248
Mortgage loans held for sale	158,619	177,866
Loans, net	6,122,605	5,989,790
Mortgage servicing rights	36,996	32,064
Derivative instruments	6,982	9,108
Financial liabilities
Deposits	7,231,849	7,069,411
Short-term borrowings	9,955	109,676
Other long-term borrowings	135	147
Federal Home Loan Bank advances	8,917	8,777
Junior subordinated debentures	64,908	73,301
Subordinated notes	101,300	101,000
Derivative instruments	6,524	5,910
Fair Value | Level 1
Financial assets
Cash and cash equivalents	370,744	306,224
Securities held to maturity	0	0
Securities available for sale	0	0
Mortgage loans held for sale	0	0
Loans, net	0	0
Mortgage servicing rights	0	0
Derivative instruments	0	0
Financial liabilities
Deposits	5,624,281	5,438,384
Short-term borrowings	9,955	109,676
Other long-term borrowings	135	147
Federal Home Loan Bank advances	0	0
Junior subordinated debentures	0	0
Subordinated notes	0
Derivative instruments	0	0
Fair Value | Level 2
Financial assets
Cash and cash equivalents	0	0
Securities held to maturity	357,216	362,893
Securities available for sale	679,062	655,859
Mortgage loans held for sale	158,619	177,866
Loans, net	0	0
Mortgage servicing rights	0	0
Derivative instruments	6,982	9,108
Financial liabilities
Deposits	1,607,568	1,631,027
Short-term borrowings	0	0
Other long-term borrowings	0	0
Federal Home Loan Bank advances	8,917	8,777
Junior subordinated debentures	64,908	73,301
Subordinated notes	101,300
Derivative instruments	6,524	5,910
Fair Value | Level 3
Financial assets
Cash and cash equivalents	0	0
Securities held to maturity	0	0
Securities available for sale	17,823	18,389
Mortgage loans held for sale	0	0
Loans, net	6,122,605	5,989,790
Mortgage servicing rights	36,996	32,064
Derivative instruments	0	0
Financial liabilities
Deposits	0	0
Short-term borrowings	0	0
Other long-term borrowings	0	0
Federal Home Loan Bank advances	0	0
Junior subordinated debentures	0	0
Subordinated notes	0
Derivative instruments	$ 0	$ 0

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