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Loans and Allowance for Credit Losses, Impaired Loans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]          
Document Period End Date     Sep. 30, 2014    
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance $ 338,987 $ 315,630 $ 338,987 $ 315,630 $ 319,534
Impaired loans, recorded investment, total 291,204 276,246 291,204 276,246 281,970
Impaired loans, recorded investment with no related allowance 286,943 273,762 286,943 273,762 279,827
Impaired loans, recorded investment with related allowance 4,261 2,484 4,261 2,484 2,143
Impaired loans, related allowance 3,348 1,274 3,348 1,274 954
Impaired loans, average recorded investment 288,606 279,690 286,364 285,464  
Impaired loans, interest income recognized 2,518 2,261 7,346 6,272  
Commercial [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 33,513 34,247 33,513 34,247 30,826
Impaired loans, recorded investment, total 16,404 19,522 16,404 19,522 16,760
Impaired loans, recorded investment with no related allowance 12,639 18,301 12,639 18,301 15,549
Impaired loans, recorded investment with related allowance 3,765 1,221 3,765 1,221 1,211
Impaired loans, related allowance 3,166 572 3,166 572 573
Impaired loans, average recorded investment 16,753 20,198 16,582 21,996  
Impaired loans, interest income recognized 0 0 0 0  
Energy [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 1,536 1,954 1,536 1,954 1,860
Impaired loans, recorded investment, total 1,508 1,953 1,508 1,953 1,860
Impaired loans, recorded investment with no related allowance 1,508 1,953 1,508 1,953 1,860
Impaired loans, recorded investment with related allowance 0 0 0 0 0
Impaired loans, related allowance 0 0 0 0 0
Impaired loans, average recorded investment 1,563 2,115 1,684 2,207  
Impaired loans, interest income recognized 0 0 0 0  
Services [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 6,400 9,105 6,400 9,105 6,486
Impaired loans, recorded investment, total 3,584 6,927 3,584 6,927 4,922
Impaired loans, recorded investment with no related allowance 2,851 5,789 2,851 5,789 3,791
Impaired loans, recorded investment with related allowance 733 1,138 733 1,138 1,131
Impaired loans, related allowance 157 515 157 515 516
Impaired loans, average recorded investment 3,626 7,188 4,253 9,509  
Impaired loans, interest income recognized 0 0 0 0  
Wholesale/retail [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 10,792 11,262 10,792 11,262 11,009
Impaired loans, recorded investment, total 5,502 7,223 5,502 7,223 6,969
Impaired loans, recorded investment with no related allowance 5,470 7,188 5,470 7,188 6,937
Impaired loans, recorded investment with related allowance 32 35 32 35 32
Impaired loans, related allowance 9 9 9 9 9
Impaired loans, average recorded investment 5,693 6,962 6,235 5,150  
Impaired loans, interest income recognized 0 0 0 0  
Healthcare [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 2,451 2,340 2,451 2,340 2,193
Impaired loans, recorded investment, total 1,417 1,733 1,417 1,733 1,586
Impaired loans, recorded investment with no related allowance 1,417 1,685 1,417 1,685 1,538
Impaired loans, recorded investment with related allowance 0 48 0 48 48
Impaired loans, related allowance 0 48 0 48 48
Impaired loans, average recorded investment 1,420 2,202 1,502 2,450  
Impaired loans, interest income recognized 0 0 0 0  
Manufacturing [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 3,754 1,051 3,754 1,051 746
Impaired loans, recorded investment, total 3,482 843 3,482 843 592
Impaired loans, recorded investment with no related allowance 482 843 482 843 592
Impaired loans, recorded investment with related allowance 3,000 0 3,000 0 0
Impaired loans, related allowance 3,000 0 3,000 0 0
Impaired loans, average recorded investment 3,495 860 2,037 1,425  
Impaired loans, interest income recognized 0 0 0 0  
Other commercial and industrial [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 8,580 8,535 8,580 8,535 8,532
Impaired loans, recorded investment, total 911 843 911 843 831
Impaired loans, recorded investment with no related allowance 911 843 911 843 831
Impaired loans, recorded investment with related allowance 0 0 0 0 0
Impaired loans, related allowance 0 0 0 0 0
Impaired loans, average recorded investment 956 871 871 1,255  
Impaired loans, interest income recognized 0 0 0 0  
Commercial Real Estate [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 45,643 61,072 45,643 61,072 49,637
Impaired loans, recorded investment, total 30,660 52,502 30,660 52,502 40,850
Impaired loans, recorded investment with no related allowance 30,339 51,509 30,339 51,509 40,328
Impaired loans, recorded investment with related allowance 321 993 321 993 522
Impaired loans, related allowance 75 488 75 488 133
Impaired loans, average recorded investment 32,565 55,599 35,755 56,566  
Impaired loans, interest income recognized 0 0 0 0  
Residential construction and land development [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 18,953 24,219 18,953 24,219 20,804
Impaired loans, recorded investment, total 14,634 20,784 14,634 20,784 17,377
Impaired loans, recorded investment with no related allowance 14,490 20,395 14,490 20,395 17,050
Impaired loans, recorded investment with related allowance 144 389 144 389 327
Impaired loans, related allowance 57 148 57 148 107
Impaired loans, average recorded investment 14,890 20,960 16,006 23,458  
Impaired loans, interest income recognized 0 0 0 0  
Retail [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 5,425 9,380 5,425 9,380 6,133
Impaired loans, recorded investment, total 4,009 7,914 4,009 7,914 4,857
Impaired loans, recorded investment with no related allowance 4,009 7,914 4,009 7,914 4,857
Impaired loans, recorded investment with related allowance 0 0 0 0 0
Impaired loans, related allowance 0 0 0 0 0
Impaired loans, average recorded investment 4,104 8,160 4,433 8,016  
Impaired loans, interest income recognized 0 0 0 0  
Office [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 6,004 8,254 6,004 8,254 7,848
Impaired loans, recorded investment, total 3,499 6,838 3,499 6,838 6,391
Impaired loans, recorded investment with no related allowance 3,499 6,830 3,499 6,830 6,383
Impaired loans, recorded investment with related allowance 0 8 0 8 8
Impaired loans, related allowance 0 8 0 8 8
Impaired loans, average recorded investment 3,545 7,333 4,945 6,834  
Impaired loans, interest income recognized 0 0 0 0  
Multifamily [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 0 4,351 0 4,351 7
Impaired loans, recorded investment, total 0 4,350 0 4,350 7
Impaired loans, recorded investment with no related allowance 0 4,350 0 4,350 7
Impaired loans, recorded investment with related allowance 0 0 0 0 0
Impaired loans, related allowance 0 0 0 0 0
Impaired loans, average recorded investment 0 5,399 3 3,528  
Impaired loans, interest income recognized 0 0 0 0  
Industrial [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 0 0 0 0 252
Impaired loans, recorded investment, total 0 0 0 0 252
Impaired loans, recorded investment with no related allowance 0 0 0 0 252
Impaired loans, recorded investment with related allowance 0 0 0 0 0
Impaired loans, related allowance 0 0 0 0 0
Impaired loans, average recorded investment 315 0 126 1,984  
Impaired loans, interest income recognized 0 0 0 0  
Other commercial real estate [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 15,261 14,868 15,261 14,868 14,593
Impaired loans, recorded investment, total 8,518 12,616 8,518 12,616 11,966
Impaired loans, recorded investment with no related allowance 8,341 12,020 8,341 12,020 11,779
Impaired loans, recorded investment with related allowance 177 596 177 596 187
Impaired loans, related allowance 18 332 18 332 18
Impaired loans, average recorded investment 9,711 13,747 10,242 12,746  
Impaired loans, interest income recognized 0 0 0 0  
Residential Mortgage [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 259,234 218,674 259,234 218,674 237,843
Impaired loans, recorded investment, total 243,560 202,598 243,560 202,598 223,141
Impaired loans, recorded investment with no related allowance 243,385 202,328 243,385 202,328 222,731
Impaired loans, recorded investment with related allowance 175 270 175 270 410
Impaired loans, related allowance 107 214 107 214 248
Impaired loans, average recorded investment 238,615 202,062 233,127 204,735  
Impaired loans, interest income recognized 2,518 2,261 7,346 6,272  
Permanent mortage [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 44,396 39,648 44,396 39,648 41,870
Impaired loans, recorded investment, total 35,137 31,797 35,137 31,797 34,279
Impaired loans, recorded investment with no related allowance 34,962 31,527 34,962 31,527 33,869
Impaired loans, recorded investment with related allowance 175 270 175 270 410
Impaired loans, related allowance 107 214 107 214 248
Impaired loans, average recorded investment 34,045 32,272 34,708 35,829  
Impaired loans, interest income recognized 429 539 1,067 1,142  
Permanent mortgages guaranteed by US govenment agencies [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 204,807 [1] 171,935 [2] 204,807 [1] 171,935 [2] 188,436 [3]
Impaired loans, recorded investment, total 198,488 [1] 163,919 [2] 198,488 [1] 163,919 [2] 181,598 [3]
Impaired loans, recorded investment with no related allowance 198,488 [1] 163,919 [2] 198,488 [1] 163,919 [2] 181,598 [3]
Impaired loans, recorded investment with related allowance 0 [1] 0 [2] 0 [1] 0 [2] 0 [3]
Impaired loans, related allowance 0 [1] 0 [2] 0 [1] 0 [2] 0 [3]
Impaired loans, average recorded investment 194,882 [1] 162,497 [2] 189,820 [1] 162,337 [2]  
Impaired loans, interest income recognized 2,089 [1] 1,722 [2] 6,279 [1] 5,130 [2]  
Home equity {Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 10,031 7,091 10,031 7,091 7,537
Impaired loans, recorded investment, total 9,935 6,882 9,935 6,882 7,264
Impaired loans, recorded investment with no related allowance 9,935 6,882 9,935 6,882 7,264
Impaired loans, recorded investment with related allowance 0 0 0 0 0
Impaired loans, related allowance 0 0 0 0 0
Impaired loans, average recorded investment 9,688 7,293 8,599 6,569  
Impaired loans, interest income recognized 0 0 0 0  
Consumer [Member]
          
Impaired loans [Abstract]          
Impaired loans, unpaid principal balance 597 1,637 597 1,637 1,228
Impaired loans, recorded investment, total 580 1,624 580 1,624 1,219
Impaired loans, recorded investment with no related allowance 580 1,624 580 1,624 1,219
Impaired loans, recorded investment with related allowance 0 0 0 0 0
Impaired loans, related allowance 0 0 0 0 0
Impaired loans, average recorded investment 673 1,831 900 2,167  
Impaired loans, interest income recognized $ 0 $ 0 $ 0 $ 0  
[1] All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At September 30, 2014, $3.8 million of these loans were nonaccruing and $195 million were accruing based on the guarantee by U.S. government agencies.
[2] All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At September 30, 2013, $577 thousand of these loans were nonaccruing and $163 million were accruing based on the guarantee by U.S. government agencies.
[3] All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At December 31, 2013, $777 thousand of these loans were nonaccruing and $181 million were accruing based on the guarantee by U.S. government agencies.