Deposit Accounts (Tables)

12 Months Ended

Dec. 31, 2019

Deposits [Abstract]

Schedule of components of deposit accounts and weighted average interest rates

Deposit accounts and weighted average interest rates consisted of the following at December 31:

	2019				2018
	Amount		Weighted Average Interest Rate		Amount		Weighted Average Interest Rate
	(dollars in thousands)
Noninterest-bearing checking	$	3,857,660	—	%	$	3,495,737	—	%
Interest-bearing checking	586,019		0.43	%	526,088		0.38	%
Money market	3,171,164		0.83	%	2,975,578		0.89	%
Savings	235,824		0.16	%	250,271		0.14	%
Certificates of deposit accounts
250,000 or less	500,331		1.59	%	569,877		1.44	%
Greater than $250,000	547,511		1.77	%	840,800		2.12	%
Total certificates of deposit accounts	1,047,842		1.69	%	1,410,677		1.84	%
Total deposits	$	8,898,509	0.53	%	$	8,658,351	0.63	%

Schedule of aggregate annual maturities of certificates of deposit accounts

The aggregate annual maturities of certificates of deposit accounts at December 31, 2019 are as follows:

	2019
	Amount		Weighted Average Interest Rate
	(dollars in thousands)
Within 3 months	$	571,143	1.70	%
4 to 6 months	240,132		1.87	%
7 to 12 months	138,515		1.46	%
13 to 24 months	76,617		1.49	%
25 to 36 months	11,182		1.24	%
37 to 60 months	9,644		1.71	%
Over 60 months	609		2.08	%
Total	$	1,047,842	1.69	%

Schedule of interest expense on deposit accounts

Interest expense on deposit accounts for the years ended December 31 is summarized as follows:

	2019		2018		2017
	(dollars in thousands)
Checking accounts	$	2,340	$	1,167	$	365
Money market accounts	28,279		19,567		6,720
Savings	382		357		251
Certificates of deposit accounts	27,296		16,562		6,035
Total	$	58,297	$	37,653	$	13,371