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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Assets and Liabilities Measured at Fair Value on a Recurring Basis | Assets and liabilities measured at fair value on a recurring basis are summarized below:
|  |  | Fair Value Measurements at the End of the Reporting Period Using
| December 31, 2018 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (Dollars in thousands)
Assets: |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |
U.S. Government agency and U.S. Government sponsored enterprises: |  |  |  |  |  |  |
Collateralized mortgage obligations | $ | 895,122 |  |  | $ | — |  |  | $ | 895,122 |  |  | $ | — |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential | 402,605 |  |  | — |  |  | 402,605 |  |  | — |
Commercial | 469,126 |  |  | — |  |  | 469,126 |  |  | — |
Corporate securities | 3,826 |  |  | — |  |  | 3,826 |  |  | — |
Municipal securities | 75,586 |  |  | — |  |  | 74,527 |  |  | 1,059 |
Equity investments with readily determinable fair value | 23,405 |  |  | 23,405 |  |  | — |  |  | — |
Interest rate swaps | 7,059 |  |  | — |  |  | 7,059 |  |  | — |
Mortgage banking derivatives | 10 |  |  | — |  |  | 10 |  |  | — |
Liabilities: |  |  |  |  |  |  |
Interest rate swaps | 7,059 |  |  | — |  |  | 7,059 |  |  | — |
Mortgage banking derivatives | 3 |  |  | — |  |  | 3 |  |  | — |
|  |  | Fair Value Measurements at the End of the Reporting Period Using
| December 31, 2017 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (Dollars in thousands)
Assets: |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |
U.S. Government agency and U.S. Government sponsored enterprises: |  |  |  |  |  |  |
Collateralized mortgage obligations | $ | 838,709 |  |  | $ | — |  |  | $ | 838,709 |  |  | $ | — |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential | 471,214 |  |  | — |  |  | 471,214 |  |  |  |
Commercial | 301,365 |  |  | — |  |  | 301,365 |  |  |  |
Corporate securities | 4,475 |  |  | — |  |  | 4,475 |  |  | — |
Municipal securities | 82,537 |  |  | — |  |  | 81,429 |  |  | 1,108 |
Mutual funds | 21,957 |  |  | 21,957 |  |  | — |  |  | — |
Interest rate swaps | 4,506 |  |  | — |  |  | 4,506 |  |  | — |
Mortgage banking derivatives | 33 |  |  | — |  |  | 33 |  |  | — |
Liabilities: |  |  |  |  |  |  |
Interest rate swaps | 4,506 |  |  | — |  |  | 4,506 |  |  | — |
Mortgage banking derivatives | 5 |  |  | — |  |  | 5 |  |  | — |
Assets Measured at Fair Value on a Non-recurring Basis | Assets measured at fair value on a non-recurring basis at December 31, 2018 and 2017 are summarized below:
|  |  | Fair Value Measurements at the End of the Reporting Period Using
| December 31, 2018 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (Dollars in thousands)
Assets: |  |  |  |  |  |  |
Impaired loans at fair value: |  |  |  |  |  |  |
Real estate loans | $ | 9,379 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,379 |
Commercial business | 9,951 |  |  | — |  |  | — |  |  | 9,951 |
Consumer | 66 |  |  | — |  |  | — |  |  | 66 |
Other real estate owned | 5,659 |  |  | — |  |  | — |  |  | 5,659 |
|  |  | Fair Value Measurements at the End of the Reporting Period Using
| December 31, 2017 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (Dollars in thousands)
Assets: |  |  |  |  |  |  |
Impaired loans at fair value: |  |  |  |  |  |  |
Real estate loans | $ | 6,086 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,086 |
Commercial business | 3,320 |  |  | — |  |  | — |  |  | 3,320 |
Consumer | 84 |  |  | — |  |  | — |  |  | 84 |
Other real estate owned | 5,615 |  |  | — |  |  | — |  |  | 5,615 |
For assets measured at fair value on a non-recurring basis, the total net (losses) gains which include charge offs, recoveries, specific reserves, and gains and losses on sales recognized in 2018 and 2017 are summarized below:
| Year Ended December 31,
| 2018 |  | 2017
| (Dollars in thousands)
Assets: |
Impaired loans at fair value: |  |  |
Real estate loans | $ | (4,511 | ) |  | $ | (2,552 | )
Commercial business | (322 | ) |  | (5,424 | )
Trade finance | (364 | ) |  | (1,187 | )
Consumer | (1,155 | ) |  | (912 | )
Loans held for sale, net | — |  |  | 12 |
Other real estate owned | 823 |  |  | (1,962 | )
Carrying Amounts and Estimated Fair Values of Financial Instruments | Carrying amounts and estimated fair values of financial instruments, not previously presented, at December 31, 2018 and December 31, 2017 were as follows:
| December 31, 2018
| Carrying Amount |  | Estimated Fair Value |  | Fair Value Measurement
| (Dollars in thousands) |  |
Financial Assets: |  |  |  |  |
Cash and cash equivalents | $ | 459,606 |  |  | $ | 459,606 |  |  | Level 1
Interest bearing deposits in other financial institutions | 29,409 |  |  | 29,374 |  |  | Level 2/3
Equity investments without readily determinable fair values | 26,430 |  |  | 26,430 |  |  | Level 2
Loans held for sale | 25,128 |  |  | 25,943 |  |  | Level 2
Loans receivable—net | 12,005,558 |  |  | 11,913,906 |  |  | Level 3
FHLB stock | 25,461 |  |  | N/A |  |  | N/A
Accrued interest receivable | 32,225 |  |  | 32,225 |  |  | Level 2/3
Servicing assets, net | 23,132 |  |  | 24,762 |  |  | Level 3
Customers’ liabilities on acceptances | 2,281 |  |  | 2,281 |  |  | Level 2
Financial Liabilities: |  |  |  |  |
Noninterest bearing deposits | $ | 3,022,633 |  |  | $ | 3,022,633 |  |  | Level 2
Saving and other interest bearing demand deposits | 3,262,399 |  |  | 3,262,399 |  |  | Level 2
Time deposits | 5,870,624 |  |  | 5,889,030 |  |  | Level 2
FHLB advances | 821,280 |  |  | 810,812 |  |  | Level 2
Convertible debt | 194,543 |  |  | 180,525 |  |  | Level 1
Subordinated debentures | 101,929 |  |  | 116,542 |  |  | Level 2
Accrued interest payable | 31,374 |  |  | 31,374 |  |  | Level 2
Acceptances outstanding | 2,281 |  |  | 2,281 |  |  | Level 2
| December 31, 2017
| Carrying Amount |  | Estimated Fair Value |  | Fair Value Measurement
| (Dollars in thousands) |  |
Financial Assets: |  |  |  |  |
Cash and cash equivalents | $ | 492,000 |  |  | $ | 492,000 |  |  | Level 1
Interest bearing deposits in other financial institutions and other investments | 53,366 |  |  | 52,960 |  |  | Level 2/3
Loans held for sale | 29,661 |  |  | 32,048 |  |  | Level 2
Loans receivable—net | 11,018,034 |  |  | 11,112,179 |  |  | Level 3
FHLB stock | 29,776 |  |  | N/A |  |  | N/A
Accrued interest receivable | 29,979 |  |  | 29,979 |  |  | Level 2/3
Servicing assets, net | 24,710 |  |  | 27,511 |  |  | Level 3
Customers’ liabilities on acceptances | 1,691 |  |  | 1,691 |  |  | Level 2
Financial Liabilities: |  |  |  |  |
Noninterest bearing deposits | $ | 2,998,734 |  |  | $ | 2,998,734 |  |  | Level 2
Saving and other interest bearing demand deposits | 3,573,212 |  |  | 3,573,212 |  |  | Level 2
Time deposits | 4,274,663 |  |  | 4,263,585 |  |  | Level 2
FHLB advances | 1,157,693 |  |  | 1,220,529 |  |  | Level 2
Federal funds purchased | 69,900 |  |  | 69,900 |  |  | Level 2
Subordinated debentures | 100,853 |  |  | 100,853 |  |  | Level 2
Accrued interest payable | 15,961 |  |  | 15,961 |  |  | Level 2
Acceptances outstanding | 1,691 |  |  | 1,691 |  |  | Level 2

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + 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 (bbb) -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 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: 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 Reference 4: 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 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: 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 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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