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Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost - Due within one year | $ 751 |
Amortized Cost - Due after one year through five years | 17,565 |
Amortized Cost - Due after five years through ten years | 27,873 |
Amortized Cost - Due after ten years | 35,979 |
Amortized Cost | 1,893,618 | $ 1,751,879
Estimated Fair Value - Due within one year | 761 |
Estimated Fair Value - Due after one year through five years | 17,669 |
Estimated Fair Value - Due after five years through ten years | 27,901 |
Estimated Fair Value - Due after ten years | 33,081 |
Estimated Fair Value | 1,846,265 | 1,720,257
Carrying values of securities pledged as collateral | 354,600 | 359,200
Collateralized Mortgage Obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 914,710 |
Amortized Cost | 914,710 | 856,193
Estimated Fair Value | 895,122 |
Estimated Fair Value | 895,122 | 838,709
Mortgage-backed Securities, Residential |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 415,659 |
Amortized Cost | 415,659 | 477,676
Estimated Fair Value | 402,605 |
Estimated Fair Value | 402,605 | 471,214
Mortgage-backed Securities, Commercial |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 481,081 |
Amortized Cost | 481,081 | 308,046
Estimated Fair Value | 469,126 |
Estimated Fair Value | 469,126 | 301,365
Mutual funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 22,425
Estimated Fair Value |  | 21,957
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,000 | 4,997
Estimated Fair Value | $ 3,826 | $ 4,475

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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