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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment $ 19,720,294 $ 19,805,403    
Non-Graded, Recorded Investment 2,038,686 1,851,327    
Total 21,758,980 21,656,730    
Related Allowance [Abstract]        
Internally Risk Graded, Allowance 170,583 171,272    
Non-Graded, Allowance 15,579 18,417    
Total 205,340 207,457 $ 223,967 $ 230,682
Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 13,931,425 13,586,654    
Non-Graded, Recorded Investment 30,550 49,424    
Total 13,961,975 13,636,078    
Related Allowance [Abstract]        
Internally Risk Graded, Allowance 102,646 101,303    
Non-Graded, Allowance 931 923    
Total 103,577 102,226 120,083 124,269
Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Total 3,705,099 3,590,333    
Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Total 3,287,563 3,258,192    
Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Total 1,706,900 1,621,158    
Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Total 742,374 730,521    
Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Total 2,915,885 2,799,277    
Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Total 803,083 804,550    
Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Total 801,071 832,047    
Commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 4,600,651 4,764,813    
Non-Graded, Recorded Investment 0 0    
Total 4,600,651 4,764,813    
Related Allowance [Abstract]        
Internally Risk Graded, Allowance 58,134 60,026    
Non-Graded, Allowance 0 0    
Total 58,134 60,026 57,070 56,621
Commercial real estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Total 149,686 148,584    
Commercial real estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Total 890,685 919,082    
Commercial real estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Total 1,033,158 1,072,920    
Commercial real estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Total 1,210,358 1,288,065    
Commercial real estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Total 767,757 778,106    
Commercial real estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Total 549,007 558,056    
Residential mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 275,875 505,046    
Non-Graded, Recorded Investment 1,916,745 1,724,987    
Total 2,192,620 2,230,033    
Related Allowance [Abstract]        
Internally Risk Graded, Allowance 3,176 3,310    
Non-Graded, Allowance 12,492 14,654    
Total 15,668 17,964 18,431 18,451
Residential mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Total 1,098,481 1,122,610    
Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]        
Recorded Investment [Abstract]        
Total 193,308 190,866    
Residential mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Total 900,831 916,557    
Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 912,343 948,890    
Non-Graded, Recorded Investment 91,391 76,916    
Total 1,003,734 1,025,806    
Related Allowance [Abstract]        
Internally Risk Graded, Allowance 6,627 6,633    
Non-Graded, Allowance 2,156 2,840    
Total 8,783 9,473 8,408 9,124
Specific Allowance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 19,720,294 19,805,403    
Non-Graded, Recorded Investment 2,038,686 1,851,327    
Total 21,758,980 21,656,730    
Related Allowance [Abstract]        
Internally Risk Graded, Allowance 170,583 171,272    
Non-Graded, Allowance 15,579 18,417    
Total 186,162 189,689    
Nonspecific Allowance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 0 0    
Total 0 0    
Related Allowance [Abstract]        
Internally Risk Graded, Allowance 0 0    
Non-Graded, Allowance 0 0    
Total 19,178 17,768 $ 19,975 $ 22,217
Performing [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 1,998,899 1,811,557    
Performing [Member] | Commercial [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 30,489 49,371    
Performing [Member] | Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing [Member] | Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing [Member] | Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing [Member] | Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing [Member] | Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing [Member] | Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing [Member] | Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 30,489 49,371    
Performing [Member] | Commercial real estate [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing [Member] | Commercial real estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing [Member] | Commercial real estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing [Member] | Commercial real estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing [Member] | Commercial real estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing [Member] | Commercial real estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing [Member] | Commercial real estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing [Member] | Residential mortgage [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 1,877,245 1,685,424    
Performing [Member] | Residential mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 800,578 819,199    
Performing [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 186,362 183,734    
Performing [Member] | Residential mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 890,305 682,491    
Performing [Member] | Personal [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 91,165 76,762    
Performing [Member] | Pass [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 19,242,855 19,285,126    
Performing [Member] | Pass [Member] | Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 13,508,082 13,135,068    
Performing [Member] | Pass [Member] | Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,549,167 3,414,039    
Performing [Member] | Pass [Member] | Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,189,490 3,167,203    
Performing [Member] | Pass [Member] | Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,675,248 1,593,902    
Performing [Member] | Pass [Member] | Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 677,497 668,438    
Performing [Member] | Pass [Member] | Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,869,515 2,730,121    
Performing [Member] | Pass [Member] | Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 803,083 804,550    
Performing [Member] | Pass [Member] | Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 744,082 756,815    
Performing [Member] | Pass [Member] | Commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 4,549,845 4,712,826    
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 149,336 148,234    
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 857,698 885,588    
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,024,892 1,059,334    
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,203,220 1,287,471    
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 767,757 776,898    
Performing [Member] | Pass [Member] | Commercial real estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 546,942 555,301    
Performing [Member] | Pass [Member] | Residential mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 272,741 492,976    
Performing [Member] | Pass [Member] | Residential mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 272,741 269,678    
Performing [Member] | Pass [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing [Member] | Pass [Member] | Residential mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 223,298    
Performing [Member] | Pass [Member] | Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 912,187 944,256    
Performing [Member] | Other Loans Especially Mentioned [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 195,739 181,960    
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 171,717 157,866    
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 39,285 42,176    
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 60,361 49,761    
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 21,100 18,809    
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 34,033 30,934    
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 13,748 14,920    
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,190 1,266    
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 23,975 23,927    
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 11,549 11,926    
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 4,219 10,532    
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 7,136 281    
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,071 1,188    
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 52    
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 52    
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing [Member] | Other Loans Especially Mentioned [Member] | Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 47 115    
Performing [Member] | Substandard [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 168,910 214,840    
Performing [Member] | Substandard [Member] | Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 161,329 193,932    
Performing [Member] | Substandard [Member] | Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 81,315 86,624    
Performing [Member] | Substandard [Member] | Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 28,157 32,661    
Performing [Member] | Substandard [Member] | Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 9,127 7,131    
Performing [Member] | Substandard [Member] | Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 21,296 22,230    
Performing [Member] | Substandard [Member] | Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 13,854 37,698    
Performing [Member] | Substandard [Member] | Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing [Member] | Substandard [Member] | Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 7,580 7,588    
Performing [Member] | Substandard [Member] | Commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 5,323 6,439    
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,279 1,289    
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,192 3,054    
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2 12    
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 1,208    
Performing [Member] | Substandard [Member] | Commercial real estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 850 876    
Performing [Member] | Substandard [Member] | Residential mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,225 10,026    
Performing [Member] | Substandard [Member] | Residential mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,225 9,730    
Performing [Member] | Substandard [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing [Member] | Substandard [Member] | Residential mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 296    
Performing [Member] | Substandard [Member] | Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 33 4,443    
Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 112,790 123,476    
Non-Graded, Recorded Investment 39,787 39,771    
Nonaccrual [Member] | Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 90,297 99,788    
Non-Graded, Recorded Investment 61 53    
Nonaccrual [Member] | Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 35,332 47,494    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 9,555 8,567    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,425 1,316    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 9,548 8,919    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 18,768 16,538    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 15,669 16,954    
Non-Graded, Recorded Investment 61 53    
Nonaccrual [Member] | Commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 21,508 21,621    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial real estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 350 350    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial real estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 20,159 20,279    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial real estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 855 0    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial real estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 301    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial real estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial real estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 144 691    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Residential mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 909 1,991    
Non-Graded, Recorded Investment 39,500 39,564    
Nonaccrual [Member] | Residential mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 909 1,991    
Non-Graded, Recorded Investment 22,028 21,960    
Nonaccrual [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 6,946 7,132    
Nonaccrual [Member] | Residential mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 10,526 10,472    
Nonaccrual [Member] | Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 76 76    
Non-Graded, Recorded Investment $ 226 $ 154