Securities (Tables)

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of available for sale, debt securities

The following tables summarize available-for-sale securities held by the Company at December 31, 2018 and 2017:

	Available-for-Sale Securities
December 31, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in thousands)
U.S. Treasuries	$	289	$	0	$	0	$	289
Obligations of U.S. Government sponsored entities	$	493,371	$	80	$	7,553	$	485,898
Obligations of U.S. states and political subdivisions	86,260		113		933		85,440
Mortgage-backed securities – residential, issued by
U.S. Government agencies	131,831		168		3,732		128,267
U.S. Government sponsored entities	649,620		537		19,599		630,558
Non-U.S. Government agencies or sponsored entities	31		0		0		31
U.S. corporate debt securities	2,500		0		325		2,175
Total available-for-sale securities	$	1,363,902	$	898	$	32,142	$	1,332,658

Schedule of available for sale securities

	Available-for-Sale Securities
December 31, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in thousands)
Obligations of U.S. Government sponsored entities	$	507,248	$	278	$	3,333	$	504,193
Obligations of U.S. states and political subdivisions	91,659		281		421		91,519
Mortgage-backed securities – residential, issued by
U.S. Government agencies	139,747		659		2,671		137,735
U.S. Government sponsored entities	667,767		1,045		12,634		656,178
Non-U.S. Government agencies or sponsored entities	75		0		0		75
U.S. corporate debt securities	2,500		0		338		2,162
Total debt securities	1,408,996		2,263		19,397		1,391,862
Equity securities	1,000		0		87		913
Total available-for-sale securities	$	1,409,996	$	2,263	$	19,484	$	1,392,775

Schedule of held to maturity securities

The following tables summarize held-to-maturity securities held by the Company at December 31, 2018 and 2017:

	Held-to-Maturity Securities
December 31, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in thousands)
Obligations of U.S. Government sponsored entities	$	131,306	$	0	$	1,198	$	130,108
Obligations of U.S. states and political subdivisions	9,273		20		24		9,269
Total held-to-maturity debt securities	$	140,579	$	20	$	1,222	$	139,377

Held-to-Maturity Securities

	Held-to-Maturity Securities
December 31, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
(in thousands)
Obligations of U.S. Government sponsored entities	$	131,707	$	1,103	$	90	$	132,720
Obligations of U.S. states and political subdivisions	7,509		93		7		7,595
Total held-to-maturity debt securities	$	139,216	$	1,196	$	97	$	140,315

Schedule of debt securities, available for sale with unrealized losses

The following table summarizes available-for-sale securities that had unrealized losses at December 31, 2018:

December 31, 2018
Available-for-Sale Securities	Less than 12 Months				12 Months or Longer				Total
(in thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Obligations of U.S. Government sponsored entities	$	21,660	$	183	$	449,141	$	7,370	$	470,801	$	7,553
Obligations of U.S. states and political subdivisions	11,971		19		49,756		914		61,727		933
Mortgage-backed securities – residential, issued by
U.S. Government agencies	16,854		22		96,247		3,710		113,101		3,732
U.S. Government sponsored entities	61,163		662		512,216		18,937		573,379		19,599
U.S. corporate debt securities	0		0		2,175		325		2,175		325
Total available-for-sale securities	$	111,648	$	886	$	1,109,535	$	31,256	$	1,221,183	$	32,142

Schedule of available for sale securities with unrealized losses

The following table summarizes available-for-sale securities that had unrealized losses at December 31, 2017: 

December 31, 2017
Available-for-Sale Securities	Less than 12 Months				12 Months or Longer				Total
(in thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Obligations of U.S. Government sponsored entities	$	319,545	$	2,301	$	39,791	$	1,032	$	359,336	$	3,333
Obligations of U.S. states and political subdivisions	39,571		219		11,729		202		51,300		421
Mortgage-backed securities – residential, issued by
U.S. Government agencies	33,056		452		86,562		2,219		119,618		2,671
U.S. Government sponsored entities	208,524		1,941		410,767		10,693		619,291		12,634
U.S. corporate debt securities	0		0		2,163		338		2,163		338
Equity securities	0		0		913		87		913		87
Total available-for-sale securities	$	600,696	$	4,913	$	551,925	$	14,571	$	1,152,621	$	19,484

Schedule held-to-maturity securities with unrealized losses

The following table summarizes held-to-maturity securities that had unrealized losses at December 31, 2017:

Held-to-Maturity Securities	Less than 12 Months				12 Months or Longer				Total
(in thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Obligations of U.S. Government sponsored entities	$	20,505	$	90	$	0	$	0	$	20,505	$	90
Obligations of U.S. sponsored entities	5,094		7		0		0		5,094		7
Total held-to-maturity securities	$	25,599	$	97	$	0	$	0	$	25,599	$	97

The following table summarizes held-to-maturity securities that had unrealized losses at December 31, 2018:

Held-to-Maturity Securities	Less than 12 Months				12 Months or Longer				Total
(in thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Obligations of U.S. Government sponsored entities	$	4,980	$	9	$	125,128	$	1,189	$	130,108	$	1,198
Obligations of U.S. sponsored entities	8,127		24		0		0		8,127		24
Total held-to-maturity securities	$	13,107	$	33	$	125,128	$	1,189	$	138,235	$	1,222

Schedule of amortized cost and estimated fair value of debt securities by contractual maturity

The amortized cost and estimated fair value of debt securities by contractual maturity are shown in the following table. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Mortgage-backed securities are shown separately since they are not due at a single maturity date. 

December 31, 2018
(in thousands)	Amortized Cost		Fair Value
Available-for-sale securities:
Due in one year or less	$	78,160	$	77,930
Due after one year through five years	355,499		350,470
Due after five years through ten years	139,560		136,734
Due after ten years	9,201		8,668
Total	582,420		573,802
Mortgage-backed securities	781,482		758,856
Total available-for-sale debt securities	$	1,363,902	$	1,332,658

December 31, 2017
(in thousands)	Amortized Cost		Fair Value
Available-for-sale securities:
Due in one year or less	$	51,909	$	51,932
Due after one year through five years	368,846		367,377
Due after five years through ten years	162,061		160,374
Due after ten years	18,591		18,191
Total	601,407		597,874
Mortgage-backed securities	807,589		793,988
Total available-for-sale debt securities	$	1,408,996	$	1,391,862

December 31, 2018
(in thousands)	Amortized Cost		Fair Value
Held-to-maturity securities:
Due in one year or less	$	8,850	$	8,832
Due after one year through five years	86,520		85,645
Due after five years through ten years	45,209		44,900
Due after ten years	0		0
Total held-to-maturity debt securities	$	140,579	$	139,377

December 31, 2017
(in thousands)	Amortized Cost		Fair Value
Held-to-maturity securities:
Due in one year or less	$	5,980	$	5,979
Due after one year through five years	51,936		52,227
Due after five years through ten years	81,300		82,109
Due after ten years	0		0
Total held-to-maturity debt securities	$	139,216	$	140,315

Schedule of Realized Gain (Loss) [Table Text Block]

The following table sets forth information with regard to sales transactions of securities available-for-sale:

	Year ended December 31,
(in thousands)	2018			2017			2016
Proceeds from sales	$	70,652		$	64,106		$	97,296
Gross realized gains	327			19			894
Gross realized losses	(767		)	(426		)	0
Net (losses) gains on sales of available-for-sale securities	$	(440	)	$	(407	)	$	894