Loans and Leases (Credit Quality Indicators) (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	$ 3,228,277,000
Financing Receivable, Year One, Originated, Current Fiscal Year	5,461,818,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,635,131,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,728,575,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,645,809,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,487,739,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	3,453,866,000
Loans and leases	21,641,215,000	$ 20,036,986,000	$ 18,465,489,000
Consumer Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	1,392,880,000
Financing Receivable, Year One, Originated, Current Fiscal Year	1,345,637,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	853,627,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	253,438,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	447,194,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	578,606,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,869,298,000
Loans and leases	6,740,680,000	7,206,809,000	6,813,341,000
Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	23,691,000
Financing Receivable, Year One, Originated, Current Fiscal Year	32,857,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	65,114,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	26,238,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,411,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,468,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,020,000
Loans and leases	155,799,000
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	1,231,789,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	746,435,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	167,979,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	402,761,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	536,400,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,696,652,000
Loans and leases	4,782,016,000	4,972,685,000
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	1,369,189,000
Financing Receivable, Year One, Originated, Current Fiscal Year	80,991,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	42,078,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	59,221,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	39,022,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	40,738,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	171,626,000
Loans and leases	1,802,865,000	2,014,544,000
Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	1,835,397,000
Financing Receivable, Year One, Originated, Current Fiscal Year	4,116,181,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,781,504,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,475,137,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,198,615,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	909,133,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,584,568,000
Loans and leases	14,900,535,000	12,830,177,000	$ 11,652,148,000
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	28,113,000
Financing Receivable, Year One, Originated, Current Fiscal Year	966,426,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,472,718,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,334,949,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	639,091,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	593,209,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,288,131,000
Loans and leases	6,322,637,000	5,949,339,000
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member] | (7) Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	27,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	10,385,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	70,704,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	37,539,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	35,617,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	69,832,000
Loans and leases	224,104,000
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member] | (1) - (6) Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	28,113,000
Financing Receivable, Year One, Originated, Current Fiscal Year	965,582,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,461,201,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,242,322,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	527,931,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	554,630,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,165,331,000
Loans and leases	5,945,110,000
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member] | (8) Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	817,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,132,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	21,923,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	73,621,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,962,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	52,968,000
Loans and leases	153,423,000
Commercial Portfolio Segment [Member] | Non-Real Estate Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	1,024,172,000
Financing Receivable, Year One, Originated, Current Fiscal Year	2,858,624,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,137,847,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,035,468,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	518,078,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	255,172,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	255,715,000
Loans and leases	7,085,076,000	5,296,611,000
Commercial Portfolio Segment [Member] | Non-Real Estate Receivables [Member] | (7) Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	38,496,000
Financing Receivable, Year One, Originated, Current Fiscal Year	32,535,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	33,969,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	62,034,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	435,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	8,357,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	13,757,000
Loans and leases	189,583,000
Commercial Portfolio Segment [Member] | Non-Real Estate Receivables [Member] | (1) - (6) Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	936,592,000
Financing Receivable, Year One, Originated, Current Fiscal Year	2,771,373,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,052,080,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	907,110,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	481,321,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	231,280,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	218,001,000
Loans and leases	6,597,757,000
Commercial Portfolio Segment [Member] | Non-Real Estate Receivables [Member] | (8) Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	49,084,000
Financing Receivable, Year One, Originated, Current Fiscal Year	54,716,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	51,798,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	66,324,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	36,159,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	15,535,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	23,957,000
Loans and leases	297,573,000
Commercial Portfolio Segment [Member] | Non-Real Estate Receivables [Member] | (9) Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	163,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Loans and leases	163,000
Commercial Portfolio Segment [Member] | Asset Based Lending [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	783,112,000
Financing Receivable, Year One, Originated, Current Fiscal Year	26,344,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	18,464,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	23,898,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	11,333,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	10,963,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	16,484,000
Loans and leases	890,598,000	1,046,886,000
Commercial Portfolio Segment [Member] | Asset Based Lending [Member] | (7) Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	41,687,000
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	775,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Loans and leases	42,462,000
Commercial Portfolio Segment [Member] | Asset Based Lending [Member] | (1) - (6) Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	741,336,000
Financing Receivable, Year One, Originated, Current Fiscal Year	26,344,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	15,960,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	23,123,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	11,333,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	10,963,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	16,484,000
Loans and leases	845,543,000
Commercial Portfolio Segment [Member] | Asset Based Lending [Member] | (8) Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	89,000
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,504,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Loans and leases	2,593,000
Commercial Portfolio Segment [Member] | Equipment Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	264,787,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	152,475,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	80,822,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	30,113,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	49,789,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	24,238,000
Loans and leases	602,224,000	$ 537,341,000
Commercial Portfolio Segment [Member] | Equipment Loan [Member] | (7) Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	7,934,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	11,043,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	6,981,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,220,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,577,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	788,000
Loans and leases	29,543,000
Commercial Portfolio Segment [Member] | Equipment Loan [Member] | (1) - (6) Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	249,370,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	135,263,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	68,092,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	26,433,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	43,469,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	22,879,000
Loans and leases	545,506,000
Commercial Portfolio Segment [Member] | Equipment Loan [Member] | (8) Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	7,483,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	6,169,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	5,749,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,460,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4,743,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	571,000
Loans and leases	27,175,000
579 and below [Member] | Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	1,428,000
Financing Receivable, Year One, Originated, Current Fiscal Year	608,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	982,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	500,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	183,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	37,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	215,000
Loans and leases	3,953,000
579 and below [Member] | Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	36,498,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	673,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,278,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,179,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	53,794,000
Loans and leases	97,422,000
579 and below [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	30,501,000
Financing Receivable, Year One, Originated, Current Fiscal Year	129,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	919,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	880,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,070,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,073,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,163,000
Loans and leases	41,735,000
800+ [Member] | Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	7,171,000
Financing Receivable, Year One, Originated, Current Fiscal Year	2,827,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,725,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,610,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	658,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	115,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	190,000
Loans and leases	19,296,000
800+ [Member] | Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	360,336,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	283,755,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	61,048,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	178,849,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	268,044,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	805,537,000
Loans and leases	1,957,569,000
800+ [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	542,600,000
Financing Receivable, Year One, Originated, Current Fiscal Year	30,604,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	16,567,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	25,205,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	14,439,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	17,192,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	59,956,000
Loans and leases	706,563,000
740-799 [Member] | Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	5,119,000
Financing Receivable, Year One, Originated, Current Fiscal Year	12,317,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	21,036,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	8,925,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,493,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	457,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	263,000
Loans and leases	49,610,000
740-799 [Member] | Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	654,973,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	288,173,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	58,249,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	133,416,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	176,286,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	492,720,000
Loans and leases	1,803,817,000
740-799 [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	434,271,000
Financing Receivable, Year One, Originated, Current Fiscal Year	34,797,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	13,565,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	19,715,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	11,073,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	12,839,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	43,802,000
Loans and leases	570,062,000
670 to 739 [Member] | Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	8,403,000
Financing Receivable, Year One, Originated, Current Fiscal Year	14,761,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	31,952,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	11,843,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,284,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	665,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	228,000
Loans and leases	70,136,000
670 to 739 [Member] | Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	199,329,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	118,620,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	39,125,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	75,375,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	76,666,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	248,268,000
Loans and leases	757,383,000
670 to 739 [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	275,691,000
Financing Receivable, Year One, Originated, Current Fiscal Year	13,753,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	8,855,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	10,761,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	10,206,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	7,318,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	44,025,000
Loans and leases	370,609,000
580-669 [Member] | Consumer Portfolio Segment [Member] | Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	1,570,000
Financing Receivable, Year One, Originated, Current Fiscal Year	2,344,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,419,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,360,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	793,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	194,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	124,000
Loans and leases	12,804,000
580-669 [Member] | Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	17,151,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	19,389,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	8,884,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	11,843,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	12,225,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	96,333,000
Loans and leases	165,825,000
580-669 [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Revolving	86,126,000
Financing Receivable, Year One, Originated, Current Fiscal Year	1,708,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,172,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,660,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,234,000
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,316,000
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	16,680,000
Loans and leases	$ 113,896,000