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Fair Value Measurements and Fair Value of Financial Instruments, Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financial assets [Abstract] |  |
HTM securities | $ 495,411 | $ 525,050
Financial liabilities [Abstract] |  |
Time deposits | 776,756 | 872,411
Long-term debt | 88,914 | 104,087
Junior subordinated debt | 101,196 | 101,196
Carrying Amount [Member] | Level 2 [Member] |  |
Financial assets [Abstract] |  |
HTM securities | 494,309 | 527,948
Financial liabilities [Abstract] |  |
Time deposits | 776,756 | 872,411
Long-term debt | 88,914 | 104,087
Junior subordinated debt | 101,196 | 101,196
Carrying Amount [Member] | Level 3 [Member] |  |
Financial assets [Abstract] |  |
Net loans | 6,398,584 | 6,132,857
Estimated Fair Value [Member] | Level 2 [Member] |  |
Financial assets [Abstract] |  |
HTM securities | 495,411 | 525,050
Financial liabilities [Abstract] |  |
Time deposits | 773,160 | 868,153
Long-term debt | 88,948 | 104,113
Junior subordinated debt | 104,584 | 102,262
Estimated Fair Value [Member] | Level 3 [Member] |  |
Financial assets [Abstract] |  |
Net loans | 6,557,674 | 6,273,233
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, notional amount | 469,800 | 371,100
Fair value of derivative asset | 3,900 | 300
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional amount | 469,800 | 371,100
Fair value of derivative liability | 3,900 | 300
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 250,000 | 250,000
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative asset | 2,700 | 2,900
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative liability | $ 200 | $ 200

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- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + 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) -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 + Details
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