Loans Receivable and Credit Quality (Tables)

12 Months Ended

Dec. 31, 2017

Loans Receivable [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

The following table presents a summary of the loan portfolio based on the portfolio segment as of the dates indicated:

	December 31, 2017		December 31, 2016
	(In thousands)
Commercial and industrial	$	520,992	$	611,370
Commercial tax-exempt	418,698		398,604
Total commercial and industrial	939,690		1,009,974
Commercial real estate	2,440,220		2,302,244
Construction and land	164,990		104,839
Residential	2,682,533		2,379,861
Home equity	99,958		118,817
Consumer and other	177,637		198,619
Total	$	6,505,028	$	6,114,354

Schedule of Financing Receivables, Non Accrual Status [Table Text Block]

The following table presents nonaccrual loans receivable by class of receivable as of the dates indicated:

	December 31, 2017		December 31, 2016
	(In thousands)
Commercial and industrial	$	748	$	572
Commercial tax-exempt	—		—
Total commercial and industrial	748		572
Commercial real estate	1,985		4,583
Construction and land	110		179
Residential	8,470		10,908
Home equity	2,840		1,072
Consumer and other	142		1
Total	$	14,295	$	17,315

Past Due Financing Receivables [Table Text Block]

The following tables present the payment status of loans receivable by class of receivable as of the dates indicated:

	December 31, 2017
	Accruing Past Due						Nonaccrual Loans
	30-59 Days Past Due		60-89 Days Past Due		Total Accruing Past Due		Current		30-89 Days Past Due		90 Days or Greater Past Due		Total Non- accrual Loans		Current Accruing Loans		Total Loans Receivable
	(In thousands)
Commercial and industrial	$	10,903	$	849	$	11,752	$	355	$	—	$	393	$	748	$	508,492	$	520,992
Commercial tax-exempt	—		—		—		—		—		—		—		418,698		418,698
Commercial real estate	4,043		—		4,043		163		—		1,822		1,985		2,434,192		2,440,220
Construction and land	—		—		—		—		—		110		110		164,880		164,990
Residential	7,239		1,635		8,874		805		3,172		4,493		8,470		2,665,189		2,682,533
Home equity	355		—		355		—		71		2,769		2,840		96,763		99,958
Consumer and other	24		—		24		17		125		—		142		177,471		177,637
Total	$	22,564	$	2,484	$	25,048	$	1,340	$	3,368	$	9,587	$	14,295	$	6,465,685	$	6,505,028

	December 31, 2016
	Accruing Past Due						Nonaccrual Loans
	30-59 Days Past Due		60-89 Days Past Due		Total Accruing Past Due		Current		30-89 Days Past Due		90 Days or Greater Past Due		Total Non- accrual Loans		Current Accruing Loans		Total Loans Receivable
	(In thousands)
Commercial and industrial	$	541	$	1,078	$	1,619	$	537	$	—	$	35	$	572	$	609,179	$	611,370
Commercial tax-exempt	—		—		—		—		—		—		—		398,604		398,604
Commercial real estate	3,096		—		3,096		2,311		835		1,437		4,583		2,294,565		2,302,244
Construction and land	—		—		—		129		12		38		179		104,660		104,839
Residential	3,646		536		4,182		2,148		1,274		7,486		10,908		2,364,771		2,379,861
Home equity	245		—		245		—		80		992		1,072		117,500		118,817
Consumer and other	5,995		—		5,995		1		—		—		1		192,623		198,619
Total	$	13,523	$	1,614	$	15,137	$	5,126	$	2,201	$	9,988	$	17,315	$	6,081,902	$	6,114,354

Financing Receivable Credit Quality Indicators [Table Text Block]

The following tables present the loan portfolio’s credit risk profile by internally assigned grade and class of receivable as of the dates indicated:

	December 31, 2017
	By Loan Grade or Nonaccrual Status
	Pass		Special Mention		Accruing Substandard		Nonaccrual Loans		Total
	(In thousands)
Commercial and industrial	$	496,395	$	12,898	$	10,951	$	748	$	520,992
Commercial tax-exempt	413,139		5,559		—		—		418,698
Commercial real estate	2,346,833		56,947		34,455		1,985		2,440,220
Construction and land	146,514		11,770		6,596		110		164,990
Residential	2,672,714		—		1,349		8,470		2,682,533
Home equity	97,118		—		—		2,840		99,958
Consumer and other	177,494		—		1		142		177,637
Total	$	6,350,207	$	87,174	$	53,352	$	14,295	$	6,505,028

	December 31, 2016
	By Loan Grade or Nonaccrual Status
	Pass		Special Mention		Accruing Substandard		Nonaccrual Loans		Total
	(In thousands)
Commercial and industrial	$	591,388	$	10,133	$	9,277	$	572	$	611,370
Commercial tax-exempt	388,544		10,060		—		—		398,604
Commercial real estate	2,230,732		17,233		49,696		4,583		2,302,244
Construction and land	101,254		109		3,297		179		104,839
Residential	2,367,554		—		1,399		10,908		2,379,861
Home equity	117,745		—		—		1,072		118,817
Consumer and other	198,616		—		2		1		198,619
Total	$	5,995,833	$	37,535	$	63,671	$	17,315	$	6,114,354

Impaired Financing Receivables [Table Text Block]

The following tables present, by class of receivable, the balance of impaired loans with and without a related allowance, the associated allowance for those impaired loans with a related allowance, and the total unpaid principal on impaired loans:

	As of and for the year ended December 31, 2017
	Recorded Investment (1)		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized while Impaired
	(In thousands)
With no related allowance recorded:
Commercial and industrial	$	1,434	$	2,238	n/a		$	1,594	$	50
Commercial tax-exempt	—		—		n/a		1,001		80
Commercial real estate	1,832		3,453		n/a		3,098		1,546
Construction and land	109		109		n/a		172		—
Residential	9,337		9,709		n/a		9,033		360
Home equity	1,779		1,779		n/a		413		—
Consumer and other	—		—		n/a		—		—
Subtotal	$	14,491	$	17,288	n/a		$	15,311	$	2,036
With an allowance recorded:
Commercial and industrial	$	242	$	242	$	58	$	156	$	4
Commercial tax-exempt	—		—		—		—		—
Commercial real estate	6,855		7,284		362		6,980		322
Construction and land	—		—		—		—		—
Residential	828		828		89		2,469		89
Home equity	36		36		20		36		1
Consumer and other	125		250		125		10		—
Subtotal	$	8,086	$	8,640	$	654	$	9,651	$	416
Total:
Commercial and industrial	$	1,676	$	2,480	$	58	$	1,750	$	54
Commercial tax-exempt	—		—		—		1,001		80
Commercial real estate	8,687		10,737		362		10,078		1,868
Construction and land	109		109		—		172		—
Residential	10,165		10,537		89		11,502		449
Home equity	1,815		1,815		20		449		1
Consumer and other	125		250		125		10		—
Total	$	22,577	$	25,928	$	654	$	24,962	$	2,452

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(1) Recorded investment represents the client loan balance net of historical charge-offs and historical nonaccrual interest paid, which was applied to principal.

	As of and for the year ended December 31, 2016
	Recorded Investment (1)		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized while Impaired
	(In thousands)
With no related allowance recorded:
Commercial and industrial	$	1,793	$	2,155	n/a		$	5,288	$	249
Commercial tax-exempt	—		—		n/a		—		—
Commercial real estate	4,488		9,647		n/a		8,520		1,032
Construction and land	179		507		n/a		1,069		48
Residential	8,134		8,506		n/a		7,446		211
Home equity	—		—		n/a		—		—
Consumer and other	—		—		n/a		—		—
Subtotal	$	14,594	$	20,815	n/a		$	22,323	$	1,540
With an allowance recorded:
Commercial and industrial	$	—	$	—	$	—	$	31	$	1
Commercial tax-exempt	—		—		—		—		—
Commercial real estate	7,115		7,544		548		7,230		314
Construction and land	—		—		—		507		—
Residential	4,284		4,284		565		5,505		143
Home equity	37		37		22		3		—
Consumer and other	—		—		—		—		—
Subtotal	$	11,436	$	11,865	$	1,135	$	13,276	$	458
Total:
Commercial and industrial	$	1,793	$	2,155	$	—	$	5,319	$	250
Commercial tax-exempt	—		—		—		—		—
Commercial real estate	11,603		17,191		548		15,750		1,346
Construction and land	179		507		—		1,576		48
Residential	12,418		12,790		565		12,951		354
Home equity	37		37		22		3		—
Consumer and other	—		—		—		—		—
Total	$	26,030	$	32,680	$	1,135	$	35,599	$	1,998

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(1) Recorded investment represents the client loan balance net of historical charge-offs and historical nonaccrual interest paid, which was applied to principal.

Troubled Debt Restructurings on Financing Receivables [Table Text Block]

The following tables present the balance of TDRs that were restructured or defaulted during the periods indicated:

	As of and for the year ended December 31, 2017
	Restructured Year to Date					TDRs that defaulted that were restructured in prior twelve months
	# of Loans	Pre- modification recorded investment		Post- modification recorded investment		# of Loans	Post- modification recorded investment
	(In thousands, except number of loans)
Commercial and industrial	—	$	—	$	—	—	$	—
Commercial tax-exempt	—	—		—		—	—
Commercial real estate	—	—		—		—	—
Construction and land	—	—		—		—	—
Residential (1)	1	108		109		—	—
Home equity	—	—		—		—	—
Consumer and other	—	—		—		—	—
Total	1	$	108	$	109	—	$	—

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(1)    Represents the following concession: temporary rate reduction.

	As of and for the year ended December 31, 2016
	Restructured Year to Date					TDRs that defaulted that were restructured in prior twelve months
	# of Loans	Pre- modification recorded investment		Post- modification recorded investment		# of Loans	Post- modification recorded investment
	(In thousands, except number of loans)
Commercial and industrial	3	$	7,384	$	7,209	—	$	—
Commercial tax-exempt	—	—		—		—	—
Commercial real estate	1	1,276		1,276		1	1,276
Construction and land	—	—		—		—	—
Residential	5	1,709		1,721		—	—
Home equity	—	—		—		—	—
Consumer and other	—	—		—		—	—
Total	9	$	10,369	$	10,206	1	$	1,276

	As of and for the year ended December 31, 2016
	Extension of Term			Temporary Rate Reduction			Payment Deferral			Combination of Concessions (1)			Total Concessions
	# of Loans	Post- modifi- cation recorded invest- ment		# of Loans	Post- modifi- cation recorded invest- ment		# of Loans	Post- modifi- cation recorded invest- ment		# of Loans	Post- modifi- cation recorded invest- ment		# of Loans	Post- modifi- cation recorded invest- ment
	(In thousands, except number of loans)
Commercial and Industrial	2	$	7,209	—	$	—	—	$	—	1	$	—	3	$	7,209
Commercial tax-exempt	—	—		—	—		—	—		—	—		—	—
Commercial real estate	—	—		—	—		—	—		1	1,276		1	1,276
Construction and Land	—	—		—	—		—	—		—	—		—	—
Residential	—	—		4	519		1	1,202		—	—		5	1,721
Home Equity	—	—		—	—		—	—		—	—		—	—
Consumer and other	—	—		—	—		—	—		—	—		—	—

____________________

(1) Combination of concessions includes loans that have had more than one modification, including extension of term, temporary reduction of interest rate, and/or payment deferral.