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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment $ 19,805,403,000 $ 15,297,889,000    
Non-Graded, Recorded Investment 1,851,327,000 1,855,535,000    
Total 21,656,730,000 17,153,424,000    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 171,272,000 189,412,000    
Non-Graded, Related Allowance 18,417,000 19,053,000    
Total, Related Allowance 207,457,000 230,682,000 $ 246,159,000 $ 225,524,000
Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 13,586,654,000 10,706,035,000    
Non-Graded, Recorded Investment 49,424,000 27,940,000    
Total 13,636,078,000 10,733,975,000    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 101,303,000 123,383,000    
Non-Graded, Related Allowance 923,000 886,000    
Total, Related Allowance 102,226,000 124,269,000 140,213,000 130,334,000
Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Total 3,590,333,000 2,930,156,000    
Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Total 3,252,146,000 2,522,025,000    
Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Total 1,621,158,000 1,471,256,000    
Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Total 730,521,000 496,774,000    
Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Total 2,733,537,000 2,243,487,000    
Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Total 876,336,000 541,775,000    
Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Total 832,047,000 528,502,000    
Commercial Real Estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 4,764,813,000 3,479,987,000    
Non-Graded, Recorded Investment 0 0    
Total 4,764,813,000 3,479,987,000    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 60,026,000 56,621,000    
Non-Graded, Related Allowance 0 0    
Total, Related Allowance 60,026,000 56,621,000 50,749,000 41,391,000
Commercial Real Estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Total 148,584,000 117,245,000    
Commercial Real Estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Total 919,082,000 691,532,000    
Commercial Real Estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Total 1,072,920,000 831,770,000    
Commercial Real Estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Total 1,288,065,000 980,017,000    
Commercial Real Estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Total 778,106,000 573,014,000    
Commercial Real Estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Total 558,056,000 286,409,000    
Residential Mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 505,046,000 234,477,000    
Non-Graded, Recorded Investment 1,724,987,000 1,739,209,000    
Total 2,230,033,000 1,973,686,000    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 3,310,000 2,947,000    
Non-Graded, Related Allowance 14,654,000 15,504,000    
Total, Related Allowance 17,964,000 18,451,000 18,224,000 19,509,000
Residential Mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Total 1,320,165,000 1,043,435,000    
Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Total 190,866,000 197,506,000    
Residential Mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Total 719,002,000 732,745,000    
Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 948,890,000 877,390,000    
Non-Graded, Recorded Investment 76,916,000 88,386,000    
Total 1,025,806,000 965,776,000    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 6,633,000 6,461,000    
Non-Graded, Related Allowance 2,840,000 2,663,000    
Total, Related Allowance 9,473,000 9,124,000 8,773,000 4,164,000
Specific Allowance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 19,805,403,000 15,297,889,000    
Non-Graded, Recorded Investment 1,851,327,000 1,855,535,000    
Total 21,656,730,000 17,153,424,000    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 171,272,000 189,412,000    
Non-Graded, Related Allowance 18,417,000 19,053,000    
Total, Related Allowance 189,689,000 208,465,000    
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, Related Allowance 0 0    
Non-Graded, Related Allowance 0 0    
Total, Related Allowance 17,768,000 22,217,000 $ 28,200,000 $ 30,126,000
Performing Financial Instruments [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 1,811,557,000 1,808,995,000    
Performing Financial Instruments [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 184,000,000 188,000,000    
Performing Financial Instruments [Member] | Commercial [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 49,371,000 27,870,000    
Performing Financial Instruments [Member] | Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 49,371,000 27,870,000    
Performing Financial Instruments [Member] | Commercial Real Estate [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial Real Estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial Real Estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial Real Estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial Real Estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Residential Mortgage [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 1,685,424,000 1,692,925,000    
Performing Financial Instruments [Member] | Residential Mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 819,199,000 784,928,000    
Performing Financial Instruments [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 183,734,000 188,327,000    
Performing Financial Instruments [Member] | Residential Mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 682,491,000 719,670,000    
Performing Financial Instruments [Member] | Personal [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 76,762,000 88,200,000    
Performing Financial Instruments [Member] | Pass [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 19,285,126,000 14,797,279,000    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 13,135,068,000 10,226,089,000    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,414,039,000 2,632,986,000    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,161,157,000 2,478,945,000    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,593,902,000 1,443,917,000    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 668,438,000 472,869,000    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,664,381,000 2,182,231,000    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 876,336,000 541,775,000    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 756,815,000 473,366,000    
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 4,712,826,000 3,463,002,000    
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 148,234,000 113,190,000    
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 885,588,000 686,915,000    
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,059,334,000 824,408,000    
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,287,471,000 979,969,000    
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 776,898,000 573,014,000    
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 555,301,000 285,506,000    
Performing Financial Instruments [Member] | Pass [Member] | Residential Mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 492,976,000 232,492,000    
Performing Financial Instruments [Member] | Pass [Member] | Residential Mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 467,233,000 232,492,000    
Performing Financial Instruments [Member] | Pass [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Pass [Member] | Residential Mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 25,743,000 0    
Performing Financial Instruments [Member] | Pass [Member] | Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 944,256,000 875,696,000    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 181,960,000 118,175,000    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 157,866,000 103,324,000    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 42,176,000 60,288,000    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 49,761,000 13,927,000    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 18,809,000 19,263,000    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 30,934,000 6,653,000    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 14,920,000 3,186,000    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,266,000 7,000    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial Real Estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 23,927,000 13,303,000    
Performing Financial Instruments [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 1,828,000    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial Real Estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 11,926,000 4,243,000    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial Real Estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 10,532,000 7,087,000    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial Real Estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 281,000 0    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial Real Estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,188,000 145,000    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Residential Mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 52,000 0    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Residential Mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 52,000 0    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Residential Mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 115,000 1,548,000    
Performing Financial Instruments [Member] | Substandard [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 214,840,000 241,101,000    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 193,932,000 239,389,000    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 86,624,000 144,598,000    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 32,661,000 26,533,000    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 7,131,000 5,502,000    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 22,230,000 11,290,000    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 37,698,000 43,305,000    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 7,588,000 8,161,000    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 6,439,000 827,000    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 395,000    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,289,000 98,000    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,054,000 0    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 12,000 48,000    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,208,000 0    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 876,000 286,000    
Performing Financial Instruments [Member] | Substandard [Member] | Residential Mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 10,026,000 822,000    
Performing Financial Instruments [Member] | Substandard [Member] | Residential Mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 9,730,000 822,000    
Performing Financial Instruments [Member] | Substandard [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Substandard [Member] | Residential Mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 296,000 0    
Performing Financial Instruments [Member] | Substandard [Member] | Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 4,443,000 63,000    
Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 123,476,000 141,334,000    
Non-Graded, Recorded Investment 39,771,000 46,540,000    
Nonaccrual [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 7,100,000 9,200,000    
Nonaccrual [Member] | Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 99,788,000 137,233,000    
Non-Graded, Recorded Investment 53,000 70,000    
Nonaccrual [Member] | Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 47,494,000 92,284,000    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 8,567,000 2,620,000    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,316,000 2,574,000    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 8,919,000 5,962,000    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 16,538,000 14,765,000    
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 16,954,000 19,028,000    
Non-Graded, Recorded Investment 53,000 70,000    
Nonaccrual [Member] | Commercial Real Estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 21,621,000 2,855,000    
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 350,000 1,832,000    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial Real Estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 20,279,000 276,000    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial Real Estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 275,000    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial Real Estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 301,000 0    
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 691,000 472,000    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Residential Mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,991,000 1,163,000    
Non-Graded, Recorded Investment 39,564,000 46,284,000    
Nonaccrual [Member] | Residential Mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,991,000 1,163,000    
Non-Graded, Recorded Investment 21,960,000 24,030,000    
Nonaccrual [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 7,132,000 9,179,000    
Nonaccrual [Member] | Residential Mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 10,472,000 13,075,000    
Nonaccrual [Member] | Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 76,000 83,000    
Non-Graded, Recorded Investment $ 154,000 $ 186,000