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Allowance for Loan and Lease Losses (Allocation of Allowance for Loan and Lease Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | $ 1,175,441 | $ 1,266,395 |  |
Allowance for loan and lease losses | 221,893 | 218,795 | $ 206,216 | $ 204,466
Non-PCI impaired loans less than $500,00 collectively evaluated | 49,100 | 47,400 |  |
Non-PCI Loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 170,034 | 150,189 |  |
ALLL for loans and leases individually evaluated for impairment | 9,728 | 9,210 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 77,199 | 79,491 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 78,447 | 56,908 |  |
Financing Receivable, Individually Evaluated for Impairment | 155,646 | 136,399 |  |
Average balance | 141,733 | 135,982 | 136,404 |
Interest income recognized | 4,790 | 4,466 | 4,675 |
Allowance for loan and lease losses | 211,867 | 205,026 | 189,904 | 182,837
Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 2,267 | 1,880 |  |
ALLL for loans and leases individually evaluated for impairment | 209 | 152 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,351 | 1,279 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 506 | 284 |  |
Financing Receivable, Individually Evaluated for Impairment | 1,857 | 1,563 |  |
Average balance | 1,642 | 1,112 | 481 |
Interest income recognized | 34 | 38 | 12 |
Allowance for loan and lease losses | 4,571 | 3,269 | 2,168 | 732
Non-PCI Loans | Commercial | Construction and land development |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 1,110 | 1,172 |  |
ALLL for loans and leases individually evaluated for impairment | 185 | 151 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 788 | 1,002 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 | 43 |  |
Financing Receivable, Individually Evaluated for Impairment | 788 | 1,045 |  |
Average balance | 858 | 2,700 | 3,164 |
Interest income recognized | 37 | 138 | 146 |
Allowance for loan and lease losses | 24,470 | 28,877 | 16,288 | 11,961
Non-PCI Loans | Commercial | Mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 78,936 | 82,658 |  |
ALLL for loans and leases individually evaluated for impairment | 3,648 | 3,488 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 39,135 | 42,875 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 34,520 | 33,486 |  |
Financing Receivable, Individually Evaluated for Impairment | 73,655 | 76,361 |  |
Average balance | 73,815 | 82,146 | 89,934 |
Interest income recognized | 2,596 | 2,671 | 3,129 |
Allowance for loan and lease losses | 45,005 | 48,278 | 69,896 | 85,189
Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 10,475 | 16,637 |  |
ALLL for loans and leases individually evaluated for impairment | 665 | 1,732 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 6,326 | 8,920 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,648 | 3,680 |  |
Financing Receivable, Individually Evaluated for Impairment | 7,974 | 12,600 |  |
Average balance | 9,847 | 11,878 | 14,587 |
Interest income recognized | 376 | 417 | 510 |
Allowance for loan and lease losses | 53,697 | 50,225 | 43,116 | 30,727
Non-PCI Loans | Commercial | Lease financing |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 2,571 | 1,074 |  |
ALLL for loans and leases individually evaluated for impairment | 397 | 75 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,890 | 1,002 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 24 | 72 |  |
Financing Receivable, Individually Evaluated for Impairment | 1,914 | 1,074 |  |
Average balance | 1,753 | 1,307 | 1,718 |
Interest income recognized | 51 | 63 | 74 |
Allowance for loan and lease losses | 6,127 | 5,907 | 5,524 | 4,286
Non-PCI Loans | Commercial | Other |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 521 | 233 |  |
ALLL for loans and leases individually evaluated for impairment | 0 | 23 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 | 142 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 521 | 0 |  |
Financing Receivable, Individually Evaluated for Impairment | 521 | 142 |  |
Average balance | 426 | 687 | 1,673 |
Interest income recognized | 22 | 33 | 37 |
Allowance for loan and lease losses | 4,689 | 3,127 | 1,855 | 3,184
Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 5,224 | 3,030 |  |
ALLL for loans and leases individually evaluated for impairment | 68 | 109 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 592 | 645 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,959 | 1,968 |  |
Financing Receivable, Individually Evaluated for Impairment | 4,551 | 2,613 |  |
Average balance | 3,383 | 983 | 829 |
Interest income recognized | 145 | 50 | 38 |
Allowance for loan and lease losses | 3,962 | 1,596 | 1,485 | 892
Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 39,946 | 32,588 |  |
ALLL for loans and leases individually evaluated for impairment | 2,733 | 2,447 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 19,135 | 20,269 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 18,707 | 11,207 |  |
Financing Receivable, Individually Evaluated for Impairment | 37,842 | 31,476 |  |
Average balance | 33,818 | 26,774 | 18,524 |
Interest income recognized | 990 | 805 | 557 |
Allowance for loan and lease losses | 15,706 | 14,447 | 14,105 | 10,661
Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 25,941 | 8,831 |  |
ALLL for loans and leases individually evaluated for impairment | 1,085 | 366 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 5,875 | 1,825 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 17,895 | 5,788 |  |
Financing Receivable, Individually Evaluated for Impairment | 23,770 | 7,613 |  |
Average balance | 14,022 | 6,915 | 4,368 |
Interest income recognized | 436 | 171 | 97 |
Allowance for loan and lease losses | 22,436 | 21,013 | 15,971 | 18,650
Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 3,043 | 2,086 |  |
ALLL for loans and leases individually evaluated for impairment | 738 | 667 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 2,107 | 1,532 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 667 | 380 |  |
Financing Receivable, Individually Evaluated for Impairment | 2,774 | 1,912 |  |
Average balance | 2,169 | 1,480 | 1,126 |
Interest income recognized | 103 | 80 | 75 |
Allowance for loan and lease losses | 31,204 | 28,287 | 19,496 | 16,555
PCI Loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Acquired loans which have adverse change in expected cash flows | 279,812 | 359,699 |  |
Allowance for loan and lease losses | 10,026 | 13,769 | 16,312 | 21,629
PCI Loans | Commercial | Other commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan and lease losses | 221 | 502 | 773 | 75
PCI Loans | Commercial | Construction and land development |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan and lease losses | 335 | 483 | 1,082 | 150
PCI Loans | Commercial | Mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan and lease losses | 6,564 | 6,423 | 7,838 | 10,135
PCI Loans | Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan and lease losses | 306 | 504 | 445 | 1,240
PCI Loans | Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan and lease losses | 0 | 0 | 0 | 183
PCI Loans | Noncommercial | Mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan and lease losses | 2,117 | 4,818 | 5,398 | 5,820
PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan and lease losses | $ 259 | $ 956 | $ 523 | $ 3,999

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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