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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | $ 960,457 | $ 1,175,441 | $ 1,266,395 |
Non-PCI impaired loans less than $500,00 collectively evaluated | 47,100 | 49,100 |  |
Non-PCI Loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 163,902 | 170,034 |  |
ALLL for loans and leases individually evaluated for impairment | 9,827 | 9,728 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 115,073 | 77,199 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 31,357 | 78,447 |  |
Financing Receivable, Individually Evaluated for Impairment | 146,430 | 155,646 |  |
Average balance | 153,123 | 141,733 | 135,982 |
Interest income recognized | 5,488 | 4,790 | 4,466 |
Allowance for loan and lease losses | 214,568 | 211,867 | 205,026 | $ 189,904
Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 946 | 2,267 |  |
ALLL for loans and leases individually evaluated for impairment | 42 | 209 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 243 | 1,351 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 617 | 506 |  |
Financing Receivable, Individually Evaluated for Impairment | 860 | 1,857 |  |
Average balance | 1,225 | 1,642 | 1,112 |
Interest income recognized | 43 | 34 | 38 |
Allowance for loan and lease losses | 2,481 | 4,571 | 3,269 | 2,168
Non-PCI Loans | Commercial | Construction and land development |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 2,606 | 1,110 |  |
ALLL for loans and leases individually evaluated for impairment | 490 | 185 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,897 | 788 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 278 | 0 |  |
Financing Receivable, Individually Evaluated for Impairment | 2,175 | 788 |  |
Average balance | 1,734 | 858 | 2,700 |
Interest income recognized | 84 | 37 | 138 |
Allowance for loan and lease losses | 35,270 | 24,470 | 28,877 | 16,288
Non-PCI Loans | Commercial | Mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 61,317 | 78,936 |  |
ALLL for loans and leases individually evaluated for impairment | 2,671 | 3,648 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 34,177 | 39,135 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 21,270 | 34,520 |  |
Financing Receivable, Individually Evaluated for Impairment | 55,447 | 73,655 |  |
Average balance | 65,943 | 73,815 | 82,146 |
Interest income recognized | 2,569 | 2,596 | 2,671 |
Allowance for loan and lease losses | 43,451 | 45,005 | 48,278 | 69,896
Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 14,695 | 13,046 |  |
ALLL for loans and leases individually evaluated for impairment | 1,137 | 1,062 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 7,153 | 8,216 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,715 | 1,672 |  |
Financing Receivable, Individually Evaluated for Impairment | 9,868 | 9,888 |  |
Average balance | 9,560 | 11,600 | 13,185 |
Interest income recognized | 364 | 427 | 480 |
Allowance for loan and lease losses | 55,620 | 59,824 | 56,132 | 48,640
Non-PCI Loans | Commercial | Other |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 301 | 521 |  |
ALLL for loans and leases individually evaluated for impairment | 105 | 0 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 216 | 0 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 75 | 521 |  |
Financing Receivable, Individually Evaluated for Impairment | 291 | 521 |  |
Average balance | 135 | 426 | 687 |
Interest income recognized | 3 | 22 | 33 |
Allowance for loan and lease losses | 2,221 | 4,689 | 3,127 | 1,855
Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 4,035 | 5,224 |  |
ALLL for loans and leases individually evaluated for impairment | 81 | 68 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 2,337 | 592 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,412 | 3,959 |  |
Financing Receivable, Individually Evaluated for Impairment | 3,749 | 4,551 |  |
Average balance | 3,677 | 3,383 | 983 |
Interest income recognized | 172 | 145 | 50 |
Allowance for loan and lease losses | 2,350 | 3,962 | 1,596 | 1,485
Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 45,226 | 39,946 |  |
ALLL for loans and leases individually evaluated for impairment | 1,901 | 2,733 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 40,359 | 19,135 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,809 | 18,707 |  |
Financing Receivable, Individually Evaluated for Impairment | 42,168 | 37,842 |  |
Average balance | 41,368 | 33,818 | 26,774 |
Interest income recognized | 1,237 | 990 | 805 |
Allowance for loan and lease losses | 15,472 | 15,706 | 14,447 | 14,105
Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 31,371 | 25,941 |  |
ALLL for loans and leases individually evaluated for impairment | 2,515 | 1,085 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 25,751 | 5,875 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,101 | 17,895 |  |
Financing Receivable, Individually Evaluated for Impairment | 28,852 | 23,770 |  |
Average balance | 26,759 | 14,022 | 6,915 |
Interest income recognized | 900 | 436 | 171 |
Allowance for loan and lease losses | 21,862 | 22,436 | 21,013 | 15,971
Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 3,405 | 3,043 |  |
ALLL for loans and leases individually evaluated for impairment | 885 | 738 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 2,940 | 2,107 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 80 | 667 |  |
Financing Receivable, Individually Evaluated for Impairment | 3,020 | 2,774 |  |
Average balance | 2,722 | 2,169 | 1,480 |
Interest income recognized | 116 | 103 | 80 |
Allowance for loan and lease losses | 35,841 | 31,204 | 28,287 | 19,496
PCI Loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Acquired loans which have adverse change in expected cash flows | 186,648 | 279,812 |  |
Allowance for loan and lease losses | $ 9,144 | $ 10,026 | $ 13,769 | $ 16,312

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