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Fair Value Measurements - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | ---
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | $ 553,357 |  | $ 582,183 |  |  |
Interest receivable | 7,012 |  | 7,241 |  |  |
Mortgage servicing rights, net | 48,464 | $ 47,593 | 33,081 | $ 40,382 | $ 36,611 | $ 29,711
Carrying Amount |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Cash and cash equivalents | 186,278 |  | 136,327 |  |  |
Available-for-sale securities, at fair value | 553,357 |  | 582,183 |  |  |
Federal Home Loan Bank Stock | 7,743 |  | 7,743 |  |  |
Loans, net | 1,947,727 |  | 1,827,037 |  |  |
Loans held for sale | 427,416 |  | 507,442 |  |  |
Interest receivable | 7,012 |  | 7,241 |  |  |
Mortgage servicing rights, net | 48,464 |  | 32,070 |  |  |
Derivatives assets | 10,891 |  | 19,745 |  |  |
Financial liabilities: |  |  |  |  |  |
Deposits, Without stated maturities | 2,330,992 |  | 2,280,531 |  |  |
Deposits, With stated maturities | 396,601 |  | 391,031 |  |  |
Securities sold under agreement to repurchase | 16,343 |  | 21,561 |  |  |
Short term borrowings |  |  | 150,000 |  |  |
Interest payable | 501 |  | 620 |  |  |
Long-term debt | 43,790 |  | 44,892 |  |  |
Derivatives liabilities | 1,350 |  | 586 |  |  |
Fair Value |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Cash and cash equivalents | 186,278 |  | 136,327 |  |  |
Available-for-sale securities, at fair value | 553,357 |  | 582,183 |  |  |
Federal Home Loan Bank Stock | 7,743 |  | 7,743 |  |  |
Loans, net | 1,934,514 |  | 1,823,335 |  |  |
Loans held for sale | 427,416 |  | 507,442 |  |  |
Interest receivable | 7,012 |  | 7,241 |  |  |
Mortgage servicing rights, net | 48,464 |  | 33,081 |  |  |
Derivatives assets | 10,891 |  | 19,745 |  |  |
Financial liabilities: |  |  |  |  |  |
Deposits, Without stated maturities | 2,330,992 |  | 2,280,531 |  |  |
Deposits, With stated maturities | 393,788 |  | 390,484 |  |  |
Securities sold under agreement to repurchase | 16,343 |  | 21,561 |  |  |
Short term borrowings |  |  | 150,000 |  |  |
Interest payable | 501 |  | 620 |  |  |
Long-term debt | 48,426 |  | 47,377 |  |  |
Derivatives liabilities | 1,350 |  | 586 |  |  |
Fair Value | Fair Value Level 1 |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Cash and cash equivalents | 186,278 |  | 136,327 |  |  |
Financial liabilities: |  |  |  |  |  |
Deposits, Without stated maturities | 2,330,992 |  | 2,280,531 |  |  |
Securities sold under agreement to repurchase | 16,343 |  | 21,561 |  |  |
Short term borrowings |  |  | 150,000 |  |  |
Interest payable | 65 |  | 237 |  |  |
Fair Value | Fair Value Level 2 |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 548,808 |  | 577,634 |  |  |
Loans, net | 1,933,996 |  | 1,822,054 |  |  |
Loans held for sale | 427,416 |  | 507,442 |  |  |
Interest receivable | 7,012 |  | 7,241 |  |  |
Derivatives assets | 10,891 |  | 19,745 |  |  |
Financial liabilities: |  |  |  |  |  |
Deposits, With stated maturities | 393,788 |  | 390,484 |  |  |
Interest payable | 436 |  | 383 |  |  |
Long-term debt | 48,426 |  | 47,377 |  |  |
Derivatives liabilities | 1,350 |  | 586 |  |  |
Fair Value | Fair Value Level 3 |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 4,549 |  | 4,549 |  |  |
Federal Home Loan Bank Stock | 7,743 |  | 7,743 |  |  |
Loans, net | 518 |  | 1,281 |  |  |
Mortgage servicing rights, net | $ 48,464 |  | $ 33,081 |  |  |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + 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=51825145&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=73719730&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=73719730&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 Amount of interest payable on debt, including, but not limited to, trade payables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=29638263&loc=d3e39828-111592 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + 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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- Definition Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746 + Details
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