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Loans and Allowance for Loan Losses - Recorded Investment in Loans, Excluding Loans Acquired (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total Loans | $ 13,002,952 | $ 11,723,171
Loans, Excluding Acquired Loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans individually evaluated for impairment | 70,007 | 39,770
Loans collectively evaluated for impairment | 9,573,358 | 8,390,618
Total Loans | 9,643,365 | 8,430,388
Loans, Excluding Acquired Loans | Other Consumer and Other |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans individually evaluated for impairment | 1,634 | 2,159
Loans collectively evaluated for impairment | 546,055 | 318,180
Total Loans | 547,689 | 320,339
Loans, Excluding Acquired Loans | Commercial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans individually evaluated for impairment | 34,649 | 13,062
Loans collectively evaluated for impairment | 2,073,923 | 1,926,361
Total Loans | 2,108,572 | 1,939,423
Loans, Excluding Acquired Loans | Real Estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans individually evaluated for impairment | 33,203 | 24,253
Loans collectively evaluated for impairment | 6,758,818 | 5,942,200
Total Loans | 6,792,021 | 5,966,453
Loans, Excluding Acquired Loans | Credit Card |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total Loans | 403,726 | 405,470
Loans, Excluding Acquired Loans | Credit Card | Credit cards |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans individually evaluated for impairment | 521 | 296
Loans collectively evaluated for impairment | 194,562 | 203,877
Total Loans | $ 195,083 | $ 204,173

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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 and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 + Details
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