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Allowance for Credit Losses (Gross Loan and Allowance for Credit Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total Ending allowance balance | $ 235,313 |  | $ 154,343 |  |
Total Loans | 6,759,927 | $ 4,726,493 |  |  |
Originated Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 |  | 15,091 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 69,953 |  |  |
Total Ending allowance balance |  | 85,044 |  |  |
Financing Receivable, Individually Evaluated for Impairment |  | 132,324 |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 3,775,026 |  |  |
Total Loans |  | 3,907,350 |  |  |
Mortgage Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total Ending allowance balance | 50,031 |  | 42,658 |  |
Mortgage Loan [Member] | Originated Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 |  | 6,874 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 1,853 |  |  |
Total Ending allowance balance |  | 8,727 |  |  |
Financing Receivable, Individually Evaluated for Impairment |  | 71,196 |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 506,220 |  |  |
Total Loans |  | 577,416 |  |  |
Commercial Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total Ending allowance balance | 88,644 |  | 59,551 |  |
Commercial Loan [Member] | Originated Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 |  | 8,217 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 17,776 |  |  |
Total Ending allowance balance |  | 25,993 |  |  |
Financing Receivable, Individually Evaluated for Impairment |  | 61,128 |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 1,608,507 |  |  |
Total Loans |  | 1,669,635 |  |  |
Consumer Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total Ending allowance balance | 27,233 |  | 16,776 |  |
Consumer Loan [Member] | Originated Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 |  | 0 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 18,446 |  |  |
Total Ending allowance balance |  | 18,446 |  |  |
Financing Receivable, Individually Evaluated for Impairment |  | 0 |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 382,432 |  |  |
Total Loans |  | 382,432 |  |  |
Auto Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total Ending allowance balance | $ 69,405 |  | 35,358 |  |
Auto Loan [Member] | Originated Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 |  | 0 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 31,878 |  |  |
Total Ending allowance balance |  | 31,878 |  |  |
Financing Receivable, Individually Evaluated for Impairment |  | 0 |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 1,277,867 |  |  |
Total Loans |  | $ 1,277,867 |  |  |
Loans Accounted Under ASC 310-30 [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total Ending allowance balance |  |  | 73,764 | $ 71,005 | $ 66,981
Loans Accounted Under ASC 310-30 [Member] | Mortgage Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total Ending allowance balance |  |  | 34,267 | 42,421 | 30,607
Loans Accounted Under ASC 310-30 [Member] | Commercial Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total Ending allowance balance |  |  | 37,208 | 25,448 | 30,226
Loans Accounted Under ASC 310-30 [Member] | Consumer Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total Ending allowance balance |  |  | 0 | 0 | 4
Loans Accounted Under ASC 310-30 [Member] | Auto Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total Ending allowance balance |  |  | $ 2,289 | $ 3,136 | $ 6,144

X
- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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=118952595&loc=d3e4428-111522 + Details
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