Transfers of Financial Assets (Tables)

12 Months Ended

Dec. 31, 2017

Transfers of Financial Assets

Schedule of carrying amounts of assets pledged as collateral

(dollars in thousands)	2017		2016
Public deposits	$	2,800,690	$	2,521,761
Federal Home Loan Bank		2,388,702		2,097,233
Federal Reserve Bank		914,454		935,672
Repurchase agreements		—		10,066
ACH transactions		151,526		152,394
Interest rate swaps		27,502		30,399
Total	$	6,282,874	$	5,747,525

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

	December 31, 2016
	Remaining Contractual Maturity of the Agreements
	Up to				Greater than
(dollars in thousands)	30 days		30-90 days		90 days		Total
Government agency collateralized mortgage obligations	$	1,200	$	—	$	4,951	$	6,151
Government-sponsored enterprises mortgage-backed securities		—		2,000		1,000		3,000
Gross amount of recognized liabilities for repurchase agreements in Note 10	$	1,200	$	2,000	$	5,951	$	9,151