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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Level 1 | Carrying Amount |  |
Financial Assets: |  |
Cash and cash equivalents | $ 236,101 | $ 298,389
Level 1 | Estimated Fair Value |  |
Financial Assets: |  |
Cash and cash equivalents | 236,101 | 298,389
Level 2 | Carrying Amount |  |
Financial Assets: |  |
Loans held for sale | 13,843 | 8,273
Customers' liabilities on acceptances | 2,769 | 1,463
Financial Liabilities: |  |
Noninterest-bearing deposits | 1,695,040 | 1,694,427
Saving and other interest bearing demand deposits | 2,133,340 | 2,170,748
Time deposits | 2,639,031 | 2,475,801
FHLB advances | 530,495 | 530,591
Subordinated debentures | 42,371 | 42,327
Bank's liabilities on acceptances outstanding | 2,769 | 1,463
Level 2 | Estimated Fair Value |  |
Financial Assets: |  |
Loans held for sale | 14,535 | 8,669
Customers' liabilities on acceptances | 2,769 | 1,463
Financial Liabilities: |  |
Noninterest-bearing deposits | 1,695,040 | 1,694,427
Saving and other interest bearing demand deposits | 2,133,340 | 2,170,748
Time deposits | 2,643,155 | 2,478,858
FHLB advances | 535,782 | 532,137
Subordinated debentures | 44,138 | 44,084
Bank's liabilities on acceptances outstanding | 2,769 | 1,463
Level 3 | Carrying Amount |  |
Financial Assets: |  |
Loans receivable - net | 6,295,079 | 6,171,933
Level 3 | Estimated Fair Value |  |
Financial Assets: |  |
Loans receivable - net | 6,713,741 | 6,559,838
Other Investments [Member] | Level 2 | Carrying Amount |  |
Financial Liabilities: |  |
Investments, Fair Value Disclosure | 49,365 | 47,895
Other Investments [Member] | Level 2 | Estimated Fair Value |  |
Financial Liabilities: |  |
Investments, Fair Value Disclosure | $ 49,461 | $ 47,919

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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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