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Loans - Concentrations and Restrictions (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Consumer | Consumer Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk, percentage | 23.00% |
Consumer | Residential Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk, percentage | 24.00% |
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial loans | $ 20,545,198 | $ 20,271,968
Loans pledged to secure potential borrowings | 6,100,000 |
Commercial | Finance And Insurance Companies |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial loans | $ 2,800,000 |
Percentage of commercial & industrial loan portfolio | 17.00% |
Percentage contributed in total loan | 10.00% |
Commercial | Loans To Mortgage Companies |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial loans | $ 2,000,000 |
Percentage of commercial & industrial loan portfolio | 12.00% |
Percentage contributed in total loan | 7.00% |
Commercial | Finance Insurance And Loans To Mortgage Companies |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of commercial & industrial loan portfolio | 29.00% |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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- Definition Amount, before allowance and fees, of loans and leases receivable. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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