Transfers of Financial Assets (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2016

Dec. 31, 2015

Transfers of Financial Assets

Schedule of carrying amounts of assets pledged as collateral

(dollars in thousands)	September 30, 2016		December 31, 2015
Public deposits	$	2,558,916	$	2,704,686
Federal Home Loan Bank		2,040,505		2,537,665
Federal Reserve Bank		935,641		814,177
Repurchase agreements		10,066		237,699
ACH transactions		156,761		151,330
Interest rate swaps		64,352		29,436
Total	$	5,766,241	$	6,474,993

	December 31,
(dollars in thousands)	2015		2014
Public deposits	$	2,704,686	$	2,567,624
Federal Home Loan Bank		2,537,665		2,383,984
Federal Reserve Bank		814,177		699,006
Repurchase agreements		237,699		397,338
ACH transactions		151,330		152,610
Interest rate swaps		29,436		26,624
Total	$	6,474,993	$	6,227,186

Schedule of disaggregation of gross amount of recognized liabilities for repurchase agreements by class of collateral pledged

	September 30, 2016
	Remaining Contractual Maturity of the Agreements
	Up to				Greater than
(dollars in thousands)	30 days		31-90 days		90 days		Total
Collateralized mortgage obligations:
Government agency	$	—	$	—	$	2,000	$	2,000
Government-sponsored enterprises		—		—		7,151		7,151
Gross amount of recognized liabilities for repurchase agreements in Note 7	$	—	$	—	$	9,151	$	9,151

	December 31, 2015
	Remaining Contractual Maturity of the Agreements
	Up to				Greater than
(dollars in thousands)	30 days		31-90 days		90 days		Total
Non-government asset-backed securities	$	92	$	92	$	—	$	184
Collateralized mortgage obligations:
Government agency		768		—		170,669		171,437
Government-sponsored enterprises		5,340		4,908		34,282		44,530
Gross amount of recognized liabilities for repurchase agreements in Note 7	$	6,200	$	5,000	$	204,951	$	216,151

	December 31, 2015
	Remaining Contractual Maturity
	of the Agreements
	Up to				Greater than
(dollars in thousands)	30 days		30 ‑ 90 days		90 days		Total
Non‑government asset‑backed securities	$	92	$	92	$	—	$	184
Collateralized mortgage obligations:
Government agency		768		—		170,669		171,437
Government‑sponsored enterprises		5,340		4,908		34,282		44,530
Gross amount of recognized liabilities for repurchase agreements in Note 10	$	6,200	$	5,000	$	204,951	$	216,151