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Loans Receivable and Allowance for Credit Losses (Loan Purchases, Sales and Transfers) (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Loans Receivable and Allowance for Credit Losses |  |
Loans transferred from held-for-investment to held-for-sale | $ 145,872,000 | $ 110,223,000
Sales | 153,417,000 | 114,865,000
Purchases | 310,848,000 | 133,180,000
Allowance for loan and lease losses, Loans transferred from held-for-investment to held-for-sales, write-offs | 39,000 | 0
Net gains on sales of loans | 1,781,000 | 950,000
Commercial and industrial (“C&I”) | Originated |  |
Loans Receivable and Allowance for Credit Losses |  |
Sales | 131,000,000.0 | 114,900,000
Loans sold in secondary market | Purchased |  |
Loans Receivable and Allowance for Credit Losses |  |
Sales | 22,400,000 | 0
Commercial lending | Commercial and industrial (“C&I”) |  |
Loans Receivable and Allowance for Credit Losses |  |
Loans transferred from held-for-investment to held-for-sale | 125,840,000 | 102,973,000
Sales | 125,879,000 | 102,973,000
Purchases | 178,678,000 | 130,583,000
Commercial lending | Commercial real estate (“CRE”) |  |
Loans Receivable and Allowance for Credit Losses |  |
Loans transferred from held-for-investment to held-for-sale | 20,032,000 | 7,250,000
Sales | 20,032,000 | 7,250,000
Purchases | 0 | 0
Commercial lending | Real estate loan | Multifamily residential |  |
Loans Receivable and Allowance for Credit Losses |  |
Loans transferred from held-for-investment to held-for-sale | 0 | 0
Sales | 0 | 0
Purchases | 370,000 | 1,513,000
Consumer lending | Real estate loan | Single-family residential |  |
Loans Receivable and Allowance for Credit Losses |  |
Loans transferred from held-for-investment to held-for-sale | 0 | 0
Sales | 7,506,000 | 4,642,000
Purchases | $ 131,800,000 | $ 1,084,000

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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + 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)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of increase from purchase of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919244-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of decrease from sale and reclassification to held-for-sale of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919244-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of expense reversal of allowance for credit loss on financing receivable transferred to held-for-sale classification. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120238483&loc=SL120268815-111004 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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