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Fair Value Measurements - Assets and Liabilities Not Measured and Reported at Fair Value on a Recurring Basis or Nonrecurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financial assets |  |
Securities held to maturity | $ 0 | $ 356,282
Securities available for sale | 1,150,459 | 674,248
Mortgage loans held for sale | 207,288 | 177,866
Mortgage servicing rights | 35,930 | 26,302
Carrying Value |  |
Financial assets |  |
Cash and cash equivalents | 332,200 | 306,224
Securities held to maturity |  | 356,282
Securities available for sale | 1,150,459 | 674,248
Mortgage loans held for sale | 207,288 | 177,866
Loans, net | 7,404,077 | 6,159,972
Mortgage servicing rights | 35,930 | 26,302
Derivative instruments | 8,569 | 9,108
Financial liabilities |  |
Deposits | 8,118,518 | 7,059,137
Short-term borrowings | 384,230 | 109,676
Other long-term borrowings | 111 | 147
Federal Home Loan Bank advances | 7,760 | 8,542
Junior subordinated debentures | 85,744 | 95,643
Subordinated notes | 114,088 | 98,127
Derivative instruments | 8,429 | 5,910
Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 332,200 | 306,224
Securities held to maturity |  | 362,893
Securities available for sale | 1,150,459 | 674,248
Mortgage loans held for sale | 207,288 | 177,866
Loans, net | 7,373,870 | 5,989,790
Mortgage servicing rights | 41,822 | 32,064
Derivative instruments | 8,569 | 9,108
Financial liabilities |  |
Deposits | 8,118,636 | 7,069,411
Short-term borrowings | 384,230 | 109,676
Other long-term borrowings | 111 | 147
Federal Home Loan Bank advances | 8,005 | 8,777
Junior subordinated debentures | 67,785 | 73,301
Subordinated notes | 118,575 | 101,000
Derivative instruments | 8,429 | 5,910
Fair Value | Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 332,200 | 306,224
Securities held to maturity |  | 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 | 6,290,726 | 5,438,384
Short-term borrowings | 384,230 | 109,676
Other long-term borrowings | 111 | 147
Federal Home Loan Bank advances | 0 | 0
Junior subordinated debentures | 0 | 0
Subordinated notes | 0 | 0
Derivative instruments | 0 | 0
Fair Value | Level 2 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Securities held to maturity |  | 362,893
Securities available for sale | 1,141,499 | 655,859
Mortgage loans held for sale | 207,288 | 177,866
Loans, net | 0 | 0
Mortgage servicing rights | 0 | 0
Derivative instruments | 8,569 | 9,108
Financial liabilities |  |
Deposits | 1,827,910 | 1,631,027
Short-term borrowings | 0 | 0
Other long-term borrowings | 0 | 0
Federal Home Loan Bank advances | 8,005 | 8,777
Junior subordinated debentures | 67,785 | 73,301
Subordinated notes | 118,575 | 101,000
Derivative instruments | 8,429 | 5,910
Fair Value | Level 3 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Securities held to maturity |  | 0
Securities available for sale | 8,960 | 18,389
Mortgage loans held for sale | 0 | 0
Loans, net | 7,373,870 | 5,989,790
Mortgage servicing rights | 41,822 | 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 | 0
Derivative instruments | $ 0 | $ 0

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