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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 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financial assets |  |
Securities available for sale | $ 1,088,779 | $ 671,488
Mortgage loans held for sale | 245,046 | 108,316
Mortgage servicing rights | 43,239 | 39,339
Derivative instruments | 181 | 0
Carrying Value |  |
Financial assets |  |
Cash and cash equivalents | 292,952 | 281,453
Securities available for sale | 1,088,779 | 671,488
Mortgage loans held for sale | 245,046 | 108,316
Loans, net | 7,720,302 | 7,574,111
Mortgage servicing rights | 43,239 | 39,339
Derivative instruments | 9,120 | 5,977
Financial liabilities |  |
Deposits | 8,380,720 | 7,921,075
Short-term borrowings | 313,393 | 89,814
Other long-term borrowings | 73 | 98
Federal Home Loan Bank advances | 7,082 | 7,493
Junior subordinated debentures | 86,155 | 85,881
Subordinated notes | 114,044 | 114,074
Derivative instruments | 6,491 | 6,039
Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 292,952 | 281,453
Securities available for sale | 1,088,779 | 671,488
Mortgage loans held for sale | 245,046 | 108,316
Loans, net | 7,608,411 | 7,514,185
Mortgage servicing rights | 57,575 | 47,868
Derivative instruments | 9,120 | 5,977
Financial liabilities |  |
Deposits | 8,376,008 | 7,923,476
Short-term borrowings | 313,393 | 89,814
Other long-term borrowings | 73 | 98
Federal Home Loan Bank advances | 7,135 | 7,661
Junior subordinated debentures | 82,166 | 69,702
Subordinated notes | 116,650 | 118,650
Derivative instruments | 6,491 | 6,039
Fair Value | Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 292,952 | 281,453
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 | 6,508,375 | 6,114,391
Short-term borrowings | 313,393 | 89,814
Other long-term borrowings | 73 | 98
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 available for sale | 1,078,378 | 662,100
Mortgage loans held for sale | 245,046 | 108,316
Loans, net | 0 | 0
Mortgage servicing rights | 0 | 0
Derivative instruments | 9,120 | 5,977
Financial liabilities |  |
Deposits | 1,867,633 | 1,809,085
Short-term borrowings | 0 | 0
Other long-term borrowings | 0 | 0
Federal Home Loan Bank advances | 7,135 | 7,661
Junior subordinated debentures | 82,166 | 69,702
Subordinated notes | 116,650 | 118,650
Derivative instruments | 6,491 | 6,039
Fair Value | Level 3 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Securities available for sale | 10,401 | 9,388
Mortgage loans held for sale | 0 | 0
Loans, net | 7,608,411 | 7,514,185
Mortgage servicing rights | 57,575 | 47,868
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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- Definition 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. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond 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 942 -SubTopic 470 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64702-112823 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 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 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount, after allowance for bad debt, of mortgage loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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